{"id":"environmental-protection-diesel-and-petrol-regulations-1999","name":"Environmental Protection (Diesel and Petrol) Regulations 1999","slug":"environmental-protection-diesel-and-petrol-regulations-1999","collection":"regulation","jurisdiction":"wa","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":176586,"registerId":"wa-environmental-protection-diesel-and-petrol-regulations-1999-current","compilationNumber":null,"startDate":"2026-04-05","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"Environmental Protection (Diesel and Petrol) Regulations 1999","content":"![Crest]()Western Australia\n\nEnvironmental Protection Act 1986\n\nEnvironmental Protection (Petrol) Regulations 1999\n\n- **Reprinted under the *Reprints Act 1984* as**\n- **at 23 November 2012**\n\n\nWestern Australia\n\nEnvironmental Protection (Petrol) Regulations 1999\n\nContents\n\nPart 1 — Preliminary\n\n1. Citation 1\n\n2. Commencement 1\n\n3. Terms used 1\n\n3A. Regulations do not apply to some fuel 3\n\n3B. Exemption if state of emergency declared 4\n\nPart 3 — Petrol\n\n9. Methyl tertiary-butyl ether in petrol, limit on 5\n\n10. Reid Vapour Pressure limits for petrol supplied in Perth area in summer until 15 Apr 2016 5\n\n11. Reid Vapour Pressure limits for petrol supplied in Perth area in summer on or after 15 Oct 2016 6\n\nPart 4 — Record keeping and testing requirements\n\n14. Person required by this Part to keep record, duties of 8\n\n16. Fuel suppliers, duties of as to petrol products 8\n\nPart 5 — Miscellaneous\n\n17. Warranty as to supply of fuel, supplier to give in some cases 10\n\n18. Methyl tertiary‑butyl ether in petrol, how measured 10\n\n19. Reid Vapour Pressure, how measured 10\n\n20. Defence to certain charges 11\n\n21. Penalty for offences 11\n\nSchedule 1 — Perth area\n\nNotes\n\nCompilation table 13\n\nDefined terms\n\n  \n\n- Crest **Reprinted under the *Reprints Act 1984* as**\n- **at 23 November 2012**\n\n\nWestern Australia\n\nEnvironmental Protection Act 1986\n\nEnvironmental Protection (Petrol) Regulations 1999\n\n## Part 1 — Preliminary\n\n##### 1. Citation\n\n\t\tThese regulations may be cited as the *Environmental Protection (Petrol) Regulations 1999* 1*.*\n\n[Regulation 1 amended: Gazette 9 Oct 2012 p. 4748.]\n\n##### 2. Commencement\n\nThese regulations come into operation on 1 January 2000.\n\n##### 3. Terms used\n\n(1) In these regulations —\n\nASTM followed by a designation refers to the standard test method of that designation, as amended from time to time, published by the standards development organisation known as ASTM International;\n\ndiesel means any petroleum or shale product that —\n\n(a) is used or capable of being used to power an internal combustion engine with compression ignition; and\n\n(b) has been entered for home consumption;\n\nentered for home consumption, in relation to fuel, means entered for home consumption or delivered for or into home consumption for the purposes of the *Customs Act 1901* or *Excise Act 1901* of the Commonwealth;\n\nfuel means —\n\n(a) petrol; or\n\n(b) any substance that is used as a substitute for petrol; or\n\n(c) any substance that is supplied or represented as petrol or as a substance that is used as a substitute for petrol;\n\nfuel distributor has the meaning given by subregulation (5);\n\nfuel supplier has the meaning given by subregulation (4);\n\nfuel warranty, in relation to any fuel, means a warranty given under regulation 17(1);\n\nmotorsport organisation includes the following organisations —\n\n(a) Confederation of Australian Motor Sport (CAMS); and\n\n(b) National Association of Speedway Racing; and\n\n(c) Australian National Drag Racing Association; and\n\n(d) Motorcycling Australia;\n\nPerth area means the area referred to in Schedule 1;\n\npetrol means any petroleum or shale product, or petrol blend, that —\n\n(a) is used or capable of being used to power an internal combustion engine with positive or spark ignition; and\n\n(b) has been entered for home consumption;\n\npetrol blend means a product that consists of a petroleum or shale product mixed with ethanol;\n\nprescribed blended petrol means petrol that contains at least 4% of ethanol by volume but no more than 10% of ethanol by volume;\n\nsummer means a period that begins at the start of 15 October in any year and ends at the end of 15 April in the following year;\n\nsupply includes deliver, give or sell;\n\nvehicle means any thing used or capable of being used to transport people or things by land or water.\n\n(2) For the purposes of these regulations a person supplies fuel at a place if the person supplies fuel to another person who takes delivery of it at that place.\n\n(3) For the purposes of these regulations fuel is used at a place if, in the case of fuel used in a vehicle, the fuel is put in the vehicle’s tank at the place, and it does not matter that all of that fuel is not used at the place.\n\n(4) For the purposes of these regulations a person is a fuel supplier if the person —\n\n(a) enters fuel for home consumption; and\n\n(b) either —\n\n(i) supplies the fuel to another person; or\n\n(ii) uses the fuel for the person’s own purposes.\n\n(5) For the purposes of these regulations a person is a fuel distributor if the person takes delivery of fuel from a fuel supplier or from another fuel distributor and supplies the fuel to another person for that person’s use, and it does not matter that the fuel distributor also uses some of the fuel for the fuel distributor’s own purposes.\n\n[Regulation 3 amended: Gazette 19 Dec 2000 p. 7285; 9 Oct 2012 p. 4749.]\n\n##### 3A. Regulations do not apply to some fuel\n\nThese regulations do not apply to —\n\n(a) petrol that is for use in an aircraft or in a motor vehicle used solely for motor racing at a racing event or facility approved or recognised by a motorsport organisation; or\n\n(b) diesel; or\n\n(c) liquefied petroleum gas; or\n\n(d) liquefied natural gas; or\n\n(e) compressed natural gas; or\n\n(f) alcohols, including ethanol.\n\n[Regulation 3A inserted: Gazette 19 Dec 2000 p. 7286; amended: Gazette 9 Oct 2012 p. 4749.]\n\n##### 3B. Exemption if state of emergency declared\n\n(1) A fuel supplier or a fuel distributor does not commit an offence under regulation 9(1) if the fuel supplier or fuel distributor supplies or uses petrol that does not conform with the specification in that regulation at a place in the State during a period when an order is in force under the *Fuel, Energy and Power Resources Act 1972* section 43 declaring that a state of emergency exists in —\n\n(a) the whole State; or\n\n(b) a part of the State that includes the place at which the petrol is supplied or used.\n\n(2) A fuel supplier does not commit an offence under any of the following (the relevant provision) —\n\n(a) regulation 10(2);\n\n(b) regulation 11(2) or (3),\n\nif the fuel supplier supplies or uses petrol that does not conform with the specification set out in the relevant provision during a period when an order is in force under the *Fuel, Energy and Power Resources Act 1972* section 43 declaring that a state of emergency exists in the Perth area, in any part of the Perth area or in the whole State.\n\n[Regulation 3B inserted: Gazette 9 Oct 2012 p. 4750.]\n\n[Part 2 (r. 4‑6) deleted: Gazette 9 Oct 2012 p. 4750.]\n\n## Part 3 — Petrol\n\n[**7, 8.** Deleted: Gazette 9 Oct 2012 p. 4750.]\n\n##### 9. Methyl tertiary-butyl ether in petrol, limit on\n\n(1) A fuel supplier or a fuel distributor who supplies or uses petrol at a place in the State commits an offence if the methyl tertiary‑butyl ether in the petrol is more than 0.10% volume by volume.\n\n(2) It is a defence to an alleged offence under subregulation (1) against a fuel distributor to prove that all petrol in the possession of the distributor at the time of the alleged offence was the subject of a fuel warranty given by the person who supplied the petrol to the distributor.\n\n[Regulation 9 amended: Gazette 9 Oct 2012 p. 4750.]\n\n##### 10. Reid Vapour Pressure limits for petrol supplied in Perth area in summer until 15 Apr 2016\n\n(1) This regulation applies until the end of 15 April 2016.\n\n(2) A fuel supplier commits an offence if —\n\n(a) during a period of 30 consecutive days that is entirely during summer, the fuel supplier supplies or uses petrol at a place in the Perth area; and\n\n(b) the average Reid Vapour Pressure of the petrol over that 30‑day period, calculated under subregulation (3), is —\n\n(i) for petrol (other than prescribed blended petrol) — more than 67 kPa; or\n\n(ii) for prescribed blended petrol — more than 74 kPa.\n\n(3) For the purposes of subregulation (2)(b), the average Reid Vapour Pressure of petrol supplied or used by a fuel supplier over a period of 30 consecutive days is the average of the Reid Vapour Pressure (ascertained in accordance with regulation 19) of at least 4 samples, taken on separate days at regular intervals in that 30 days, of the petrol supplied or used by the fuel supplier in that time.\n\n[Regulation 10 inserted: Gazette 9 Oct 2012 p. 4751.]\n\n##### 11. Reid Vapour Pressure limits for petrol supplied in Perth area in summer on or after 15 Oct 2016\n\n(1) This regulation applies on and after 15 October 2016.\n\n(2) A fuel supplier commits an offence if —\n\n(a) the fuel supplier supplies or uses petrol at a place in the Perth area during summer; and\n\n(b) the Reid Vapour Pressure of the petrol supplied or used is —\n\n(i) for petrol (other than prescribed blended petrol) — more than 64 kPa; or\n\n(ii) for prescribed blended petrol — more than 71 kPa.\n\n(3) A fuel supplier commits an offence if —\n\n(a) the fuel supplier supplies or uses petrol (other than prescribed blended petrol) at a place in the Perth area during a month in summer; and\n\n(b) the monthly volumetric average Reid Vapour Pressure of the petrol in the month during which the petrol is supplied or used, calculated under subregulation (4), is more than 62 kPa.\n\n(4) For the purposes of subregulation (3)(b), the monthly volumetric average Reid Vapour Pressure of petrol in a particular month is to be calculated as follows —\n\n(a) a sample is to be taken from each batch of the petrol supplied or used during the month by the fuel supplier;\n\n(b) the Reid Vapour Pressure of each sample taken is to be ascertained using the same standard test method prescribed by regulation 19;\n\n(c) the Reid Vapour Pressure of each sample taken is to be multiplied by a fraction that is equal to the volume of petrol in the batch from which the sample was taken divided by the total volume of petrol supplied or used in the relevant month;\n\n(d) the figures calculated under paragraph (c) for each sample of petrol are to be added together.\n\n(5) For the purposes of subregulations (3) and (4) —\n\n(a) if petrol is supplied or used during the period that begins at the start of 15 October and ends at the end of 31 October in any year — a reference in those subregulations to a month is taken to be a reference to that period; and\n\n(b) if petrol is supplied or used during the period that begins at the start of 1 April and ends at the end of 15 April in any year — a reference in those subregulations to a month is taken to be a reference to that period.\n\n[Regulation 11 inserted: Gazette 9 Oct 2012 p. 4751‑2.]\n\n[**12, 13.** Deleted: Gazette 9 Oct 2012 p. 4751.]\n\n## Part 4 — Record keeping and testing requirements\n\n[Heading inserted: Gazette 9 Oct 2012 p. 4752.]\n\n##### 14. Person required by this Part to keep record, duties of\n\n(1) If this Part requires a person to keep a record of an analysis the person must keep a record of the test used to conduct the analysis and the result of the analysis.\n\n(2) If this Part requires a person to keep a record the person must make the record and retain it for 24 months after the event to which the record relates.\n\n[**15.** Deleted: Gazette 9 Oct 2012 p. 4752.]\n\n##### 16. Fuel suppliers, duties of as to petrol products\n\n(1) In this regulation —\n\npetrol product means any product (for example, unleaded petrol or premium unleaded petrol) that consists of petrol.\n\n(2) A fuel supplier commits an offence if the fuel supplier does not, for each petrol product supplied or used by the fuel supplier at a place in the State —\n\n(a) ensure that analyses and calculations are conducted in relation to the petrol product in accordance with this regulation; and\n\n(b) keep a record of the results of those analyses and calculations in accordance with regulation 14.\n\n(3) An analysis of each petrol product must be conducted in respect of each batch of the petrol product entered for home consumption.\n\n(4) An analysis under subregulation (3) must —\n\n(a) determine the amount of methyl tertiary‑butyl ether in the petrol product in accordance with the standard test method prescribed by regulation 18; and\n\n(b) if the petrol product is supplied or used in the Perth area during summer — determine the Reid Vapour Pressure of the petrol product in accordance with a standard test method prescribed by regulation 19.\n\n(5) If, before the end of 15 April 2016, a fuel supplier supplies or uses a petrol product in the Perth area during summer, the average Reid Vapour Pressure of the petrol product for each consecutive period of 30 days during summer must be calculated in accordance with regulation 10(3).\n\n(6) If, on or after 15 October 2016, a fuel supplier supplies or uses a petrol product (other than a petrol product consisting of prescribed blended petrol) in the Perth area during summer, the monthly volumetric average Reid Vapour Pressure of the petrol product for each month in summer must be calculated in accordance with regulation 11(4).\n\n[Regulation 16 inserted: Gazette 9 Oct 2012 p. 4752‑3.]\n\n## Part 5 — Miscellaneous\n\n##### 17. Warranty as to supply of fuel, supplier to give in some cases\n\n(1) A person who supplies fuel to another person must, if the other person is —\n\n(a) a fuel distributor; or\n\n(b) a person who supplies fuel to a fuel distributor,\n\ngive that other person a written warranty that the fuel has been supplied in accordance with these regulations.\n\n(2) A person who supplies fuel is not required to give such a warranty in respect of regulation 9(1), 10(2) or 11(2) or (3) if, by reason of regulation 3B, the person was not required to comply with those regulations when supplying the fuel.\n\n(3) A person who does not comply with subregulation (1) commits an offence.\n\n(4) A person who gives a warranty that fuel has been supplied in accordance with these regulations when in fact the fuel has not been so supplied commits an offence.\n\n[Regulation 17 inserted: Gazette 9 Oct 2012 p. 4753‑4.]\n\n##### 18. Methyl tertiary‑butyl ether in petrol, how measured\n\nFor the purposes of these regulations the amount of methyl tertiary‑butyl ether in any petrol is the amount determined in accordance with ASTM D4815.\n\n[Regulation 18 inserted: Gazette 9 Oct 2012 p. 4754.]\n\n##### 19. Reid Vapour Pressure, how measured\n\nFor the purposes of these regulations the Reid Vapour Pressure of petrol is to be determined in accordance with any of the following standard test methods —\n\n(a) ASTM D323;\n\n(b) ASTM D5190;\n\n(c) ASTM D5191.\n\n[Regulation 19 inserted: Gazette 9 Oct 2012 p. 4754.]\n\n##### 20. Defence to certain charges\n\nIt is a defence to an alleged offence under these regulations involving the use of fuel in a vehicle at a place to prove that the fuel was put into the vehicle at a place at which it would not have been an offence under these regulations to use the fuel.\n\n##### 21. Penalty for offences\n\nA person who commits an offence under these regulations is liable to a fine of $5 000.\n\n[**22.** Deleted: Gazette 9 Oct 2012 p. 4754.]\n\nSchedule 1 — Perth area\n\n[r. 3]\n\nThe area covered by these local government districts (under the *Local Government Act 1995*) —\n\n| Armadale | Gingin | Rockingham |\n| --- | --- | --- |\n| Bassendean | Gosnells | Serpentine-Jarrahdale |\n| Bayswater | Joondalup | South Perth |\n| Belmont | Kalamunda | Stirling |\n| Beverley | Kwinana | Subiaco |\n| Boddington | Mandurah | Swan |\n| Cambridge | Melville | Toodyay |\n| Canning | Mosman Park | Victoria Park |\n| Chittering | Mundaring | Vincent |\n| Claremont | Murray | Wandering |\n| Cockburn | Nedlands | Wanneroo |\n| Cottesloe | Northam | Waroona |\n| East Fremantle | Peppermint Grove | York |\n| Fremantle | Perth |  |\n\n\n[Schedule 1 amended: Gazette 9 Oct 2012 p. 4754.]\n\n[Schedule 2 and 3 deleted: Gazette 9 Oct 2012 p. 4754.]\n\n![dline]()\n\nNotes\n\n1 This reprint is a compilation as at 23 November 2012 of the *Environmental Protection (Petrol) Regulations 1999* and includes the amendments made by the other written laws referred to in the following table. The table also contains information about any reprint.\n\nCompilation table\n\n| **Citation** | **Gazettal** | **Commencement** |\n| --- | --- | --- |\n| *Environmental Protection (Diesel and Petrol) Regulations 1999* 2 | 17 Dec 1999 p. 6305-25 | 1 Jan 2000 (see r. 2) |\n| *Environmental Protection (Diesel and Petrol) Amendment Regulations 2000* | 19 Dec 2000 p. 7285-8 | 19 Dec 2000 |\n| *Environmental Protection (Diesel and Petrol) Amendment Regulations 2012* | 9 Oct 2012 p. 4748‑54 | r. 1 and 2: 9 Oct 2012 (see r. 2(a));   Regulations other than r. 1 and 2: 10 Oct 2012 (see r. 2(b)) |\n| **Reprint 1: The *Environmental Protection (Petrol) Regulations 1999* as at 23 Nov 2012** (includes amendments listed above) | | |\n\n\n2 Now known as the *Environmental Protection (Petrol) Regulations 1999*; citation changed (see note under r. 1).\n\nDefined terms\n\n*[This is a list of terms defined and the provisions where they are defined. The list is not part of the law.]*\n\n**Defined term Provision(s)**\n\nASTM 3(1)\n\ndiesel 3(1)\n\nentered for home consumption 3(1)\n\nfuel 3(1)\n\nfuel distributor 3(1)\n\nfuel supplier 3(1)\n\nfuel warranty 3(1)\n\nmotorsport organisation 3(1)\n\nPerth area 3(1)\n\npetrol 3(1)\n\npetrol blend 3(1)\n\npetrol product 16(1)\n\nprescribed blended petrol 3(1)\n\nrelevant provision 3B(2)\n\nsummer 3(1)\n\nsupply 3(1)\n\nvehicle 3(1)\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":true,"description":"The instrument as reprinted has narrowed its operational scope compared with earlier material in the compilation. The compiled front matter and notes show the instrument was originally titled to cover both diesel and petrol, but the current text and reg. 3A explicitly exclude diesel and other fuels (reg. 3A). The compilation table and notes record a citation change from the Environmental Protection (Diesel and Petrol) Regulations 1999 to the Environmental Protection (Petrol) Regulations 1999 (compilation notes and note 2). Additionally, several provisions and parts were deleted in later amendments (e.g. Part 2 and various regs noted as deleted), indicating that the regulatory coverage and structure were reduced and re‑scoped in amendments (see compilation table and deleted‑note entries)."},"complexity_factors":["Technical measurement standards (ASTM methods for MTBE and multiple accepted RVP tests) (regs. 18–19)","Different RVP thresholds by petrol type (normal vs. prescribed blended petrol) and seasonality (regs. 10–11)","Phased/dated application of different RVP rules (reg. 10 applies until 15 Apr 2016; reg. 11 applies on/after 15 Oct 2016)","Sampling and averaging rules including 30‑day averaging with specified minimum samples versus monthly volumetric averaging with batch volume weighting (regs. 10(3), 11(3)–(4))","Detailed definitions that determine who bears obligations (fuel supplier, fuel distributor, entered for home consumption) (reg. 3)","Recordkeeping and warranty requirements with specified retention periods and criminal penalties for false warranties (regs. 14, 17)","Statutory exemptions and defences tied to other legislation (state of emergency declarations under Fuel, Energy and Power Resources Act 1972 s. 43) (reg. 3B)","Deleted provisions and re‑naming in the compilation history that affect instrument scope and interpretation (compilation notes, reg. 3A)"],"plain_english_summary":"### What this regulation does (mechanically)\n\n- Sets product limits for petrol sold or used in Western Australia: a cap on methyl tertiary‑butyl ether (MTBE) at 0.10% v/v (reg. 9) and seasonal Reid Vapour Pressure (RVP) limits for petrol supplied in the Perth area with different thresholds phased in by date (regs. 10 and 11).\n- Requires fuel suppliers to analyse every batch they enter for home consumption and to keep records of those analyses for 24 months (regs. 16(3), 14(2)).\n- Prescribes the test methods to be used to measure MTBE (ASTM D4815) and RVP (one of ASTM D323, D5190 or D5191) (regs. 18–19).\n- Requires suppliers who sell fuel to fuel distributors (or to other suppliers who supply distributors) to give a written warranty that the fuel complies with these regulations; giving a false warranty is an offence (reg. 17).\n- Creates specific defences and limited exemptions, including a defence for a distributor who can show the petrol it held was warranted by its supplier (reg. 9(2)), a defence for vehicle‑use offences when the fuel was put into the vehicle at a place where use would be lawful (reg. 20), and an emergency exemption while a state of emergency order under the Fuel, Energy and Power Resources Act 1972 s. 43 is in force (reg. 3B).\n- Sets a monetary penalty for breach: fine of $5,000 (reg. 21).\n\n### Who this affects\n\n- Fuel suppliers (defined at reg. 3(4)): entities that enter fuel for home consumption and either supply it to others or use it themselves. These suppliers carry primary legal responsibility for testing, recordkeeping and warranties (regs. 16, 14, 17).\n- Fuel distributors (defined at reg. 3(5)): entities that take delivery from a supplier or another distributor and supply fuel onward. Distributors are subject to the MTBE limit (reg. 9) and may rely on supplier warranties as a defence (reg. 9(2)).\n- Businesses and sites in the Perth area during summer (defined at reg. 3(1) and Schedule 1) that buy, sell or use petrol are directly affected by the RVP seasonal caps and the sampling/averaging rules (regs. 10–11, 16).\n- Organisations and uses expressly excluded from the regulations: petrol for aircraft and motor racing at approved facilities, diesel, LPG, LNG, CNG, and alcohols including ethanol (reg. 3A).\n\n### Why it matters (stated purpose and practical effects)\n\n- The instrument operates by limiting specific chemical content (MTBE) and vapour pressure (RVP) in petrol sold or used in the State (regs. 9, 10, 11). The stated regulatory effect is achieved by shifting measurement, recordkeeping and warranty obligations onto suppliers and, to a lesser extent, distributors (regs. 16, 14, 17). Those obligations create ongoing compliance costs (testing every batch, maintaining records for 24 months) and legal exposure (fines, warranty offences).\n\n### Costs, incentives and trade-offs (mechanics, with section citations)\n\n- Testing and recordkeeping costs: suppliers must analyse each batch entered for home consumption and keep test method details and results for 24 months (reg. 16(3)–(4), reg. 14). The RVP monthly volumetric averaging method (reg. 11(4)) requires batch‑level sampling and volume weighting, increasing analytical and administrative work for higher numbers of batches.\n- Contractual and liability effects: suppliers must provide written warranties to downstream distributors or suppliers to distributors (reg. 17(1)). A distributor may avoid liability for MTBE breaches if it can show it held warranted product from its supplier (reg. 9(2)). Suppliers therefore have an incentive to control testing and to manage warranty risk (reg. 17(2)–(4)).\n- Differential treatment of petrol types: the rules treat ethanol‑blended petrol (\"prescribed blended petrol\", 4–10% ethanol) differently by permitting higher RVP thresholds for such blends (regs. 3(1), 10(2)(b), 11(2)(b)). That creates a mechanical allowance for those blends during summer.\n- Flexibility and enforcement: measurement is constrained to recognised ASTM methods (regs. 18–19), but multiple accepted tests for RVP are available (reg. 19(a)–(c)), which allows suppliers some choice of method but requires consistency when averaging (reg. 11(4)(b)).\n- Emergency and limited defences: an order under Fuel, Energy and Power Resources Act s. 43 suspends some obligations while in force (reg. 3B); reg. 20 provides a defence where the fuel was put into the vehicle at a place where its use would have been lawful. These clauses shift consequences in specific circumstances away from suppliers/distributors.\n- Enforcement exposure: failure to comply with testing, recordkeeping, warranty or substance/RVP limits exposes suppliers or distributors to fines up to $5,000 (regs. 16(2), 17(3)–(4), 9(1), 21).\n\n### Implementation and discretion points\n\n- The regulations place most decision‑making about sampling frequency and testing on suppliers (reg. 16(3)–(5)), who must choose sampling days, test methods (from those listed) and averaging calculations (reg. 10(3), 11(4)).\n- The emergency exemption (reg. 3B) depends on a declaration made under the Fuel, Energy and Power Resources Act 1972; the timing and geographic scope of that declaration determine when suppliers are exempted.\n\n### Net behavioural effect (mechanical)\n\n- Suppliers will need to adopt batch testing and record systems, give warranties to downstream purchasers, and ensure product RVP and MTBE levels meet the prescribed thresholds or rely on emergency exceptions or supplier warranties. Distributors will rely on supplier warranties to manage their own legal exposure (regs. 16, 17, 9(2))."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The legislation has significantly narrowed from its original scope. Originally enacted as the 'Environmental Protection (Diesel and Petrol) Regulations 1999', it originally covered both diesel and petrol. The 2012 amendments removed all diesel-related provisions (deleting Part 2 and regulations 4-6), deleted provisions about fuel standards for vehicles (regulations 7-8), and removed Schedules 2 and 3. The regulations were renamed to 'Environmental Protection (Petrol) Regulations 1999' to reflect this narrower focus. The current version regulates only petrol quality (specifically MTBE content and vapour pressure), whereas the original apparently covered broader fuel standards including diesel."},"complexity_factors":["Multiple defined terms (15 defined terms in regulation 3, plus 'petrol product' in regulation 16)","Temporal complexity: Different RVP limits apply before and after specific dates (15 April 2016 and 15 October 2016), with transitional provisions","Geographic limitation: Rules apply specifically to 'Perth area' defined by 30 local government districts in Schedule 1","Nested calculations: Regulation 11(4) requires volumetric averaging with a 4-step mathematical formula","Cross-references to external standards: References to ASTM International test methods (D4815, D323, D5190, D5191) which are not reproduced in the text","Conditional exemptions: Regulation 3B provides emergency exemptions tied to declarations under a separate Act (Fuel, Energy and Power Resources Act 1972)","Deleted provisions: Significant portions of original regulations removed (Parts 2, regulations 4-8, 12-13, 15, 22, Schedules 2-3), creating a fragmented structure","Dual averaging methods: Different calculation methods for RVP depending on time period (30-day average vs monthly volumetric average)"],"plain_english_summary":"These regulations set rules for petrol quality in Western Australia to reduce air pollution. They limit how much of certain chemicals can be in petrol sold or used in the state.\n\n**Key rules:**\n- **MTBE limit**: Petrol cannot contain more than 0.10% of methyl tertiary-butyl ether (MTBE) — a chemical additive that can contaminate groundwater.\n- **Vapour pressure limits**: In the Perth metropolitan area during summer (15 October to 15 April), petrol must meet strict limits on Reid Vapour Pressure (RVP). RVP measures how easily petrol evaporates — lower RVP means less smog-forming fumes. The limits differ for regular petrol versus ethanol-blended petrol, and the rules changed in 2016 to become stricter.\n- **Record keeping**: Fuel suppliers must test their petrol and keep records for 24 months.\n- **Warranties**: Suppliers must give written guarantees to distributors that fuel meets these standards.\n\n**Who it affects:**\n- Fuel suppliers and distributors (companies that import, wholesale, or sell petrol)\n- Businesses that use large amounts of petrol for their own vehicles or equipment\n\n**Exemptions:**\n- Racing fuel for approved motor sport events\n- Diesel, LPG, natural gas, and pure alcohol fuels\n- Emergency situations when the government declares a state of emergency under fuel shortage laws\n\n**Why it matters:**\nThese rules reduce harmful air pollution (ground-level ozone and smog) during hot Perth summers when evaporation is highest. They also protect groundwater from MTBE contamination. The regulations were originally broader (covering diesel too) but were scaled back to focus only on petrol."},"issue_detection":{"absurdities":[],"contradictions":[]},"summary":{"complexity_score":1,"scope_assessment":{"changed":false,"description":"Scope assessment is impossible — the legislative text was not accessible. The page has been removed from the Western Australian legislation website and no substantive content was retrievable for analysis."},"complexity_factors":["No substantive legislative content was provided — only a webpage error message was available for analysis","Cannot assess actual regulatory complexity, cross-references, definitions, or technical requirements","Title suggests potential technical complexity around fuel standards and environmental compliance, but this cannot be confirmed"],"plain_english_summary":"**What we know:** This appears to be a set of Western Australian regulations titled the *Environmental Protection (Diesel and Petrol) Regulations 1999*, which would ordinarily govern the standards, composition, or sale of diesel and petrol fuels in Western Australia for environmental protection purposes.\n\n**The problem:** The actual content of this legislation is **unavailable** — the page has been removed from the Western Australian legislation website due to system upgrades. Only the page error message and an Acknowledgement of Country were retrieved, not the legislation itself.\n\n**What this means for you:** It is not possible to accurately summarise how this law affects you, what it requires, or who it applies to based on the content provided. To find the current, authoritative text of these regulations, you should:\n- Visit the [Western Australian Legislation website](https://www.legislation.wa.gov.au) and search directly for the title\n- Contact the Parliamentary Counsel's Office Helpdesk (linked on the original page)\n- Check if the regulations have been repealed, replaced, or consolidated into newer legislation"}},"importantCases":[],"_links":{"self":"/api/acts/environmental-protection-diesel-and-petrol-regulations-1999","history":"/api/acts/environmental-protection-diesel-and-petrol-regulations-1999/history","analysis":"/api/acts/environmental-protection-diesel-and-petrol-regulations-1999/analysis","conflicts":"/api/acts/environmental-protection-diesel-and-petrol-regulations-1999/conflicts","importantCases":"/api/acts/environmental-protection-diesel-and-petrol-regulations-1999/important-cases","documents":"/api/acts/environmental-protection-diesel-and-petrol-regulations-1999/documents"}}