Canterbury- B G ContractingSouthbrook
- Barrett P F Contract LtdHornby
- Brewer G N LtdAranui
- Canterbury Waterblast Techniques LtdNew Brighton
- Cornerstone Drainage (2002) LtdHalswell
- Dave Gutry Construction LtdMarshland
- Drainage Consultancy & Design LtdKaiapoi
- Elite Plumbing & Drainage LtdParklands
- Giltrap DrainageIslington
- Hanson Mini ExcavationsTimaru
- Ken Beeby LtdTimaru
- Local ConstructionHornby
- M H Plumbing & Drainage LtdShirley
- Mel Hansen Contracting LtdRangiora
- Rossiter Contracting LtdOxford
- Stuart Wills ContractingAshburton
- T P Holling
- Whitestone Limited
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