When a water system receives an unsafe or total coliform positive sample result, the owner or operator must collect a set of repeat samples for the Total Coliform Rule within 24 hours in the distribution system; additionally, all ground water sources must be sampled for the Ground Water Rule.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Tech Tip: Follow-up to an Unsafe Total Coliform Positive Sample (PDF)(4 pp, 319 K, 4/24/2020)