Each public water systems must comply with the Public Notification regulations (§600) of the NNPDWR. The public notification requirements are divided into three tiers and ensure requirements for publicly notifying persons served by a public water system of any noncompliance with the NNSDWA and NNPDWR.

§604 Tier 1 Public Notice: Required for NNPDWR violations and situations with significant potential to have serious adverse effects on human health as a result of short-term exposure.

Tier 1 Public Notice: Acute Health based MCL Violation(ie E.coli, Nitrate, Nitrite)

§605 Tier 2 Public Notice: Required for all other NNPDWR MCL violations and situations with potential to have chronic effects on human health.

§606 Tier 3 Public Notice: Required for all monitoring and reporting violations and situations not included in Tier 1 and Tier 2.

§611 NOTICE BY DIRECTOR ON BEHALF OF THE WATER SYSTEM The Director may give the notice required by this subpart on behalf of the owner and operator of the public water system if the Director complies with the requirements of the subpart. The owner or operator of the public water system remains responsible for ensuring that the requirements of this section are met.