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A water corporation or company is: "every person, partnership, association or corporation, other than a municipal corporation, and other than a landlord supplying his tenant, engaged in the distribution and sale of water in the Commonwealth through its pipes or mains." G.L. c. 165, § 1.
The DPU regulates privately-owned water companies.
The DPU does not regulate:
(1) City and town-owned water systems, because they are municipal corporations. G.L. c. 165, § 1. The city or town-owned water system addresses any disputes from a customer.
(2) Self-governing water and fire districts created by special acts of the General Court, unless specified in the district's enabling act. For example, some special acts authorize DPU to resolve a price disagreement between two municipalities. These districts do file their rates with DPU for informational purposes. G.L. c. 165, § 2A.
(3) Homeowner associations providing water service, unless they supply water to non-members. In those cases, DPU limits its oversight to only those non-member customers.