Frequent Questions

Under the Stage 2 Disinfectants and Disinfection Byproducts Rule, a wholesale system or consecutive system must comply with the requirements in 40 CFR Part 141, Subpart U, at the same time as the system with the earliest compliance date in the combined di

A wholesale system is a public water system (PWS) that treats source water as necessary to produce finished water and then delivers some or all of that finished water to another PWS. Delivery may be through a direct connection or through the distribution system of one or more consecutive systems (40 CFR 141.2).

A consecutive system is a PWS that receives some or all of its finished water from one or more wholesale systems. Delivery may be through a direct connection or through the distribution system of one or more consecutive systems (40 CFR 141.2).

A combined distribution system is the interconnected distribution system consisting of the distribution systems of wholesale systems and of the consecutive systems that receive finished water (40 CFR 141.2).

The preamble of the January 4, 2006, final rule discusses these definitions (71 FR 388, 409). The final rule and additional information about the rule are available at http://water.epa.gov/lawsregs/rulesregs/sdwa/stage2/regulations.cfm.
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