| Water Industry Act 1991 | 1991 c. 56 | Act | amendment to earlier affecting provision S.I. 2019/1259, art. 4 | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 6 | Yes | |
| Water Resources Act 1991 | 1991 c. 57 | Act | applied in part (Isles of Scilly) (with modifications) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 3 | Yes | |
| The Trade Effluents (Prescribed Processes and Substances) Regulations 1992 | 1992 No. 339 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(a) | Yes | |
| The Spray Irrigation (Definition) Order 1992 | 1992 No. 1096 | Order | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(b) | Not yet | |
| Environment Act 1995 | 1995 c. 25 | Act | applied in part (Isles of Scilly) (with modifications) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 4 | Yes | |
| The Environmental Licences (Suspension and Revocation) Regulations 1996 | 1996 No. 508 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(c) | Not yet | |
| The Water (Compulsory Works Powers) (Notice) Regulations 1999 | 1999 No. 221 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(d) | Not yet | |
| The Anti-Pollution Works Regulations 1999 | 1999 No. 1006 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(e) | Not yet | |
| The Non-resident Companies (General Insurance Business) Regulations 1999 | 1999 No. 1408 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(f) | Not yet | |
| The Water Industry (Prescribed Conditions) Regulations 1999 | 1999 No. 3442 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(g) | Not yet | |
| The Control of Pollution (Oil Storage) (England) Regulations 2001 | 2001 No. 2954 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(h) | Yes | |
| The Water Mergers (Modification of Enactments) Regulations 2004 | 2004 No. 3202 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(i) | Yes | |
| The Water Mergers (Determination of Turnover) Regulations 2004 | 2004 No. 3206 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(j) | Yes | |
| The Water Industry (Determination of Turnover for Penalties) Order 2005 | 2005 No. 477 | Order | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(k) | Yes | |
| The Drought Plan Regulations 2005 | 2005 No. 1905 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(l) | Not yet | |
| The Water Supply (Exceptions from Supply System Prohibitions) Regulations 2005 | 2005 No. 3075 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(m) | Not yet | |
| The Water Supply Licence (Prescribed Water Fittings Requirements) Regulations 2005 | 2005 No. 3077 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(n) | Not yet | |
| The Water Resources (Abstraction and Impounding) Regulations 2006 | 2006 No. 641 | Regulations | applied in part (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(o) | Not yet | |
| The Water Resources Management Plan Regulations 2007 | 2007 No. 727 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(p) | Not yet | |
| The Water (Prevention of Pollution) (Code of Good Agricultural Practice) (England) Order 2009 | 2009 No. 46 | Order | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(q) | Yes | |
| The Water Resources (Control of Pollution) (Silage, Slurry and Agricultural Fuel Oil) (England) Regulations 2010 | 2010 No. 639 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(r) | Yes | |
| The Water Use (Temporary Bans) Order 2010 | 2010 No. 2231 | Order | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(s) | Yes | |
| The Water Industry (Charges) (Vulnerable Groups) (Consolidation) Regulations 2015 | 2015 No. 365 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(t) | Yes | |
| The Water Quality and Supply (Fees) Order 2016 | 2016 No. 303 | Order | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(v) | Yes | |
| The Water Supply (Water Quality) Regulations 2016 | 2016 No. 614 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(u) | Yes | |
| The Private Water Supplies (England) Regulations 2016 | 2016 No. 618 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(w) | Yes | |
| The Sewerage Services (Exception from Sewerage System Prohibition) (England) Regulations 2017 | 2017 No. 244 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(x) | Yes | |
| The Water Industry Designated Codes (Appeals to the Competition and Markets Authority) Regulations 2017 | 2017 No. 447 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(y) | Yes | |
| The Water Infrastructure Adoption (Prescribed Water Fittings Requirements) (England) Regulations 2017 | 2017 No. 841 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(z) | Yes | |
| The Water Abstraction and Impounding (Exemptions) Regulations 2017 | 2017 No. 1044 | Regulations | applied (Isles of Scilly) | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 5(aa) | Yes | |
| The Isles of Scilly (Application of Water Legislation) Order 2019 | 2019 No. 1259 | art. 4(2)(c) | substituted | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 6(2) | Yes | |
| The Isles of Scilly (Application of Water Legislation) Order 2019 | 2019 No. 1259 | art. 4(8A) | inserted | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 6(3) | Yes | |
| The Isles of Scilly (Application of Water Legislation) Order 2019 | 2019 No. 1259 | art. 4(9) | substituted | The Isles of Scilly (Application of Water Legislation) Order 2020 | 2020 No. 214 | art. 6(4) | Yes | |