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Positive coliform samples prompt EPA Level‑One assessment for Star Valley Ranch water system
Summary
After two total‑coliform positive samples at Plat 20 and Foxrun well, town staff said the system must complete an EPA Level‑One assessment by June 5; staff are running MPN tests and investigating pressure‑relief‑valve areas as likely turbidity sources.
Town staff informed the council that two total‑coliform (TC) positive samples — one from Plat 20 and one from the Foxrun well — triggered the requirement for an EPA Level‑One assessment, due June 5. Administrator Trevor Aiken said staff have engaged Western Water Works to run most‑probable‑number (MPN) testing to narrow the likely source and identify any coliform strain; he noted one strain can be chlorine‑resistant, which could explain a positive sample despite measured chlorine residuals.
Council members and staff said initial field work points to areas near pressure‑relief valves (PRVs) and longer pipe stretches where stagnant water may be flushed back into the system, and they are pursuing targeted sampling and operational fixes. Aiken said the EPA will be on site on Thursday for the scheduled sanitary survey (every three years) and staff will use the assessment results to determine follow‑up actions.
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