| Water Act 2003 | 2003 c. 37 | s. 1 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 2 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(b) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 3 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(c) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 3 | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 415 | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 4 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(d) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 4 | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 416(3) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 4(1) | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 416(2) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 4(2)(a) | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 416(4) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 4(5) | words substituted | The Legal Aid, Sentencing and Punishment of Offenders Act 2012 (Fines on Summary Conviction) Regulations 2015 | 2015 No. 664 | Sch. 4 para. 34 | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 5 | coming into force | The Water Act 2003 (Commencement No. 12) Order 2017 | 2017 No. 1043 | art. 2(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 6(1) | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 6(1) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 6(2) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 7 | coming into force | The Water Act 2003 (Commencement No. 12) Order 2017 | 2017 No. 1043 | art. 2(b) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 7(3) | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 417(2)(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 7(3) | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 417(2)(b) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 8(1) | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 8(1) | coming into force | The Water Act 2003 (Commencement No. 12) Order 2017 | 2017 No. 1043 | art. 2(c) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 8(2) | coming into force | The Water Act 2003 (Commencement No. 12) Order 2017 | 2017 No. 1043 | art. 2(c) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 8(3)-(7) | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 9 | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(b) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 10(1)-(10)(12) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(b) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 10(5)(c) | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 418 | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 10(11) | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(c) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 11 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(f) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 12 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(g) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 13 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(h) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 14 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 15 | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(d) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 16(1)-(3)(6)(7) | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 16(1) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(c) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 16(4)(5) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(c) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 17 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(d) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 18 | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(f) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 19(1)-(3)(5)(6) | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(j) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 19(4) | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(g) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 20 | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(g) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 21 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(k) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 22 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(l) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 23 | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(m) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 24 | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 5 | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 25(1) | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(h) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 25(1) | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(n) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 25(2)(4) | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(h) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 25(3) | coming into force | The Water Act 2003 (Commencement No. 6, Transitional Provisions and Savings) Order 2006 | 2006 No. 984 | art. 2(n) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 26 | coming into force | The Water Act 2003 (Commencement No. 2, Transitional Provisions and Savings) Order 2004 | 2004 No. 2528 | art. 2(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 27 | coming into force | The Water Act 2003 (Commencement No. 1 and Transitional Provisions) Order 2004 | 2004 No. 641 | art. 3(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 27(1)(a) | words substituted | The Natural Resources Body for Wales (Functions) Order 2013 | 2013 No. 755 | Sch. 2 para. 419 | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 27(4) | inserted | Environment Act 2021 | 2021 c. 30 | s. 88(2) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 28 | coming into force | The Water Act 2003 (Commencement No. 2, Transitional Provisions and Savings) Order 2004 | 2004 No. 2528 | art. 2(b) | Yes | |