New Hampshire Code of Administrative Rules
Env - Department of Environmental Services
Subtitle Env-Ws - Division of Water
Chapter Env-Ws 300 - NEW HAMPSHIRE DRINKING WATER RULES
Part Env-Ws 361 - MAINTENANCE RESPONSIBILITIES
Section Env-Ws 361.04 - Distribution System Flushing

Universal Citation: NH Admin Rules Env-Ws 361.04

Current through Register No. 13, March 27, 2025

(a) The owner of each water system shall cause the system to be flushed annually, or more frequently if needed, so as tomaintain the cleanliness of the distribution piping.

(b) Flushing shall be done at times of minimum system usage.

(c) For systems serving less than 100 customers, the owner shall give written notice of scheduled flushing by first class mail or hand-delivery to each customer, at least one week in advance of the intended flushing date.

(d) For systems serving 100 or more customers, the owner shall give notice by:

(1) Providing written notice by first class mail or hand-delivery to each customer at least one week in advance of the intended flushing date; or

(2)Publishing a copy of the notice in a newspaper of general circulation for that area at least one week before the flushing begins.

(e) The flushing shall be continued for a sufficient amount of time to clean the distribution system of poor quality water and sediment. Flushing flow rate shall be not less than 2.5 feet per second.

(See Revision Note at chapter heading Env-Ws 300); ss by #8475, eff 11-30-05 (formerly Env-Ws 362.40 )

Disclaimer: These regulations may not be the most recent version. New Hampshire may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.