Utah Admin. Code R317-4-11 - Operation and Maintenance of Systems

(1) The purpose of this section is to diminish the possibility of onsite wastewater system failures by informing the owners of required periodic maintenance, servicing, and monitoring. Any more complex system shall require a higher level of operation and maintenance.

(2) Each conventional system should be assessed after the first year of operation, and thereafter at the following minimum frequency.

(a) Any system with daily flows between 1 and 3,000 gallons should be assessed every three years.

(b) Any system with daily flows between 3,001 and 5,000 gallons should be assessed every two years.

(c) Any system with non-domestic wastewater flows should be assessed yearly.

(3) Each system utilizing pressure distribution shall be inspected as outlined in Sections R317-4-13 Table 7.1 and R317-4-13 Table 7.2.

(4) Each alternative system shall be inspected as outlined in Sections R317-4-13 Table 7.1 and R317-4-13 Table 7.2.

(a) Each packed bed media system shall be sampled a minimum of every six months as outlined in Section R317-4-13 Table 7.3.

(i) The grab sample shall be taken before discharge to an absorption system.

(ii) Effluent not meeting the standards of Section R317-4-13 Table 7.3 shall be followed with two successive weekly tests of the same type within a 30-day period from the first exceedance.

(iii) If two successive samples exceed the minimum standards, the system shall be considered as malfunctioning, and shall require further evaluation and a corrective action plan, see Subsection R317-4-3(11). Effluent quality testing shall continue every two weeks until three successive samples are found to be in compliance.

(b) Each membrane bioreactor system shall be sampled a minimum of every three months as outlined in Section R317-4-13 Table 7.3.

(i) Any grab sample shall be taken before discharge to an absorption system.

(ii) Effluent not meeting the standards of Section R317-4-13 Table 7.3 shall be followed with two successive weekly tests of the same type within a 30-day period from the first exceedance.

(iii) If two successive samples exceed the minimum standards, the system shall be considered as malfunctioning, and shall require further evaluation and a corrective action plan, see Subsection R317-4-3(11) Effluent quality testing shall continue every two weeks until three successive samples are found to be in compliance.

(5) For recommended tank servicing see Subsection R317-4-14(5) Appendix E.

(6) Each distribution or drop box, if provided, should be inspected and cleaned periodically.

(7) If corrective action is required for any malfunctioning system, see Subsection R317-4-3(11).

Notes

Utah Admin. Code R317-4-11

Amended by Utah State Bulletin Number 2023-14, effective 6/29/2023