Section En 604.04 - Pressure Variation(a) Variations in pressure under normal operating conditions shall not exceed by one-third, either above or below, the average operating pressure, but in no case shall exceed 20 psi above or below the average operating pressure, unless the water utility obtains a waiver, pursuant to the waiver provisions of En 201.05.(b) The average operating pressure shall be determined by computing the arithmetical average of at least 24 consecutive hourly pressure readings.(c) Pressure variations outside the limits specified shall not be considered a violation of this rule when they:(1) Arise from unusual or extraordinary conditions;(2) Are infrequent fluctuations not exceeding 5 minutes duration; or(3) Arise from the operation of the customer's equipment.(d) In systems of widely varying elevations, a water utility may undertake to furnish a new service which does not comply with the specifications contained in either (a) and (c) above or the minimum or maximum pressure requirements of En 604.03(b), if: (1) The customer is fully advised of the conditions under which average service may be expected; and(2) The customer's agreement is secured in writing.(e) The water utility may require in the agreement referred to in (d) (2) above that its terms shall be binding on future customers served at the same location under similar circumstances.(f) The water utility shall record the agreement referred to in (d)-(2) above at the appropriate registry of deeds.(g) Except as provided in (d) above, where a water utility is providing new water service where pressures or pressure variations fail to meet the above limits, the water utility shall require installation of booster pumps, if permitted by the department of environmental services, on a case by case basis, or pressure reducing devices, by and at the expense of the customer.(h) The water utility shall provide the appropriate remediation device as described in (g) above at its own expense for the following:(1) A service connected on or after September 10, 2013, which:a. Fails to meet:1. The minimum and maximum pressure requirements of 30 psi and 100 psi established by En 604.03(b); or2. The pressure variation criteria of this section; andb. Is a location where the water utility has failed to apply the requirements of paragraph (d) or (g) above; or(2) A service connected between May 4, 1982 and September 10, 2013 which:a. Fails to meet either:1. The older 20 psi minimum or the 125 psi maximum pressure criteria of En 604.03(a); or2. The pressure variation criteria of this section.(i) Services connected as provided in (h)(2) above shall be exempt from the remediation device requirement to the extent that the pressure or pressure variation requirements of (h)(2)a. were waived by an agreement recorded pursuant to (f) above or if the service was previously remediated by the customer.N.H. Admin. Code § En 604.04
Derived from Number 15, Filed April 11, 2024, Proposed by #13911, Effective 3/21/2024, Expires 3/21/2034 (see Revision Note at chapter heading for En 600).