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.
- Tech Tip: Follow-up to an Unsafe/Total Coliform Positive Sample (PDF)(4 pp, 472 K, 3/9/2016)