| Water Industry Act 1991 | 1991 c. 56 | Act | modified (temp.) | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | Sch. 2 para. 3 4 | Yes | |
| Water Industry Act 1991 | 1991 c. 56 | specified amended provision(s) | Commencement Order | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2 3 | Yes |   commencement order for 2003 c. 37 |
| Water Resources Act 1991 | 1991 c. 57 | s. 43(1)(a) | modified | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | Sch. 1 para. 5(5) | Yes | |
| Water Resources Act 1991 | 1991 c. 57 | s. 48(1) | modified | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | Sch. 1 para. 7(10) 8(3) | Yes | |
| Water Resources Act 1991 | 1991 c. 57 | s. 189 | modified | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | Sch. 1 para. 7(10) 8(3) 9 | Yes | |
| Water Resources Act 1991 | 1991 c. 57 | specified amended provision(s) | Commencement Order | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2 3 | Yes |   commencement order for 2003 c. 37 |
| Competition and Service (Utilities) Act 1992 | 1992 c. 43 | specified amended provision(s) | Commencement Order | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2 3 | Yes |   commencement order for 2003 c. 37 |
| Competition Act 1998 | 1998 c. 41 | specified amended provision(s) | Commencement Order | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2 3 | Yes |   commencement order for 2003 c. 37 |
| 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. 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. 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. 35(1) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(a) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 36(3)-(6) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 39 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(f) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 40 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(g) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 41 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(h) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 42 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(h) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 48(1) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 48(2) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 51 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(j) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 56 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(b) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 70 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(k) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 100(2)(a)(i)(ii)(vii)s. 100(2)(a)(ix)(b)(i)(vi)s. 100(2)(a)(x)(d) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(l)(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 100(2)(a)(ii)(iii)s. 100(2)(a)(ix)(j) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(c)(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 100(2)(b)(iii) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(l)(ii)(iii) | Yes |   NOTE: S. 100(2)(b)(iii) is already expressed to be wholly in force by S.I. 2004/641, art. 4(c)(i) on 28.5.2004. |
| Water Act 2003 | 2003 c. 37 | s. 100(6) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(l)(iii) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 100(6) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(c)(ii) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 100(7) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(l)(iv) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 100(7) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(c)(iii) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 101(1) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(m) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 101(1) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(d) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 101(2) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(n) | Yes | |
| Water Act 2003 | 2003 c. 37 | s. 102(3) | modified (temp.) | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | Sch. 1 para. 2(2) 3 6 7 | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 1 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 2 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 3 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 4 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 5 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 6 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 7 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 8 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 3 para. 9 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(e) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 4 para. 2 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(b)(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 4 para. 1 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 3(b)(ii) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 7 para. 30 | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(m)(i) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 7 para. 32(1) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(m)(ii) | Yes | |
| Water Act 2003 | 2003 c. 37 | Sch. 7 para. 32(4)(a) | coming into force | The Water Act 2003 (Commencement No. 4, Transitional Provisions and Savings) Order 2005 | 2005 No. 968 | art. 2(m)(ii) | Yes | |