County lab passes DNR nitrate audit; two remediations and reporting changes required
Summary
Health staff told the board they passed a DNR nitrate audit (March 3), identified two remediations and several recommended procedural changes — notably how dilution and results are reported to private well owners — with responses due in 60 days.
The director told the board the department recently passed a DNR nitrate audit after an in-depth review of laboratory records dating back to the lab's inception in 2022. Staff said the auditor spent several hours reviewing binders and testing procedures and issued two remediations as well as recommendations for improved reporting.
"I'm very pleased to announce that we passed our DNR nitrate audit which happened on March 3rd," the director said, noting the auditor reviewed records thoroughly and provided feedback. One remediation requires the department to clarify how it reports diluted samples to private well owners: when a sample is diluted to determine a true value, the dilution step and method must be included in the owner's report. Staff said the change will be reflected in a revised result form and that responses to remediations are due within 60 days; the final audit report is expected within 30 days.
Staff described additional technical recommendations about level-of-detection studies and calibration procedures; the board praised staff for the work and for preparing binders and documentation for the audit.
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