The Iowa Department of Natural Resources (DNR) has extended the public comment period on the proposed antidegradation rules to March 4.
Antidegradation policy is one of the three components of Iowa water quality standards - 1) designated uses, 2) water quality criteria to protect those uses, and 3) antidegradation policy. The Iowa DNR is proposing a four-tiered approach, including creating a guidance document that establishes procedures for implementing the antidegradation policy.
The changes being proposed include the following:
- Incorporate by reference the document entitled “Iowa Antidegradation Implementation Procedure,” which proposes an approach to be followed in assessing and minimizing degradation of Iowa’s surface waters
- Update antidegradation policy language with four tier approach, and
- Remove High Quality (Class HQ) and High Quality Resource (Class HQR) designated uses and add several waters to the newly proposed Outstanding Iowa Water (OIW) category.
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