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When is a public notice required?

Violations or situations that require public notification fall into one of three Tiers listed below. It is the water suppliers responsibility to track violations and provide public notices to persons served within the allotted times.

Situations Requiring Tier 1 Notice (within 24 hours)

  1. Fecal coliform or E. coli in the distribution system or failure to test for fecal coliform or E. coli following any repeat coliform positive sample.
  2. Nitrate, nitrite, or total nitrate and nitrite maximum contaminant level (MCL) violation or failure to take a confirmation sample following any exceedance of the nitrate or nitrite MCL.
  3. Non-community water system operating between 10 and 20 mg/L nitrate where allowed by the DNR.
  4. Chlorine dioxide maximum residual disinfectant level (MRDL) violation, or failure to take a required sample.
  5. Turbidity MCL violation where the DNR determines Tier 1 notice is required or system does not consult with DNR within 24 hours after the system learns of the violation.
  6. Exceedance of the maximum allowable turbidity limit where the DNR determines Tier 1 notice is required or system does not consult with DNR within 24 hours after the system learns of the violation.
  7. Waterborne disease outbreak or other waterborne emergency.
  8. Other violations or situations which pose an immediate risk to public health.

Situations Requiring Tier 2 Notice (within 30 days)

  1. All MCL (maximum contaminant level), MRDL (maximum residual disinfectant level), and treatment technique violations, except where a Tier 1 notice is required.
  2. Monitoring and testing violations elevated to Tier 2 by the DNR.
  3. Failure to comply with the conditions of a variance or exemption.

Situations Requiring Tier 3 Notice (within 1 year)

  1. Monitoring and testing violations, except where a Tier 1 notice is required, or the DNR determines that a Tier 2 notice is required.
  2. Operation under a conditional waiver or variance.
  3. Special notice for the availability of unregulated contaminant monitoring results.
  4. Special notice for the exceedance of the fluoride secondary maximum contaminant level.
Last revised: Thursday August 30 2012