Rule 57 Water Quality Values
Rule 57 Water Quality Values
Rule 323.1057 (Toxic Substances) of the Part 4, Water Quality Standards, gives procedures for calculating water quality values to protect humans, wildlife, and aquatic life. These values apply to all surface waters in Michigan unless site-specific values have been derived. The following are links to state-wide and site-specific Rule 57 water quality values that have been derived for the state of Michigan.
I. State-wide Rule 57 Water Quality Values
The following are instructions for Interpreting the Rule 57 Water Quality Values Spreadsheet:
Using Rule 323.1057, the following values are determined:
- Human Noncancer Value (HNV): “drink” and “non-drink”
- Human Cancer Value (HCV): “drink” and “non-drink”
- Wildlife Value (WV): (calculated only for Bioaccumulative Chemicals of Concern)
- Final Chronic Value (FCV)
- Aquatic Maximum Value (AMV)
- Final Acute Value (FCV)
The above terms and their uses are defined in the Part 4 – Water Quality Standards. The use of these values to assess point source discharges and venting groundwater is described in the Part 8 Rules titled “Water Quality-Based Effluent Limits for Toxic Substances”. Within the table, the identification of a value as “drink” or “non-drink” refers to whether or not the receiving water for the chemical discharge is protected as a source of drinking water (See R323.1100 – Designated uses, of the Water Quality Standards).
Each chemical is identified by a Chemical Abstract Service number (CAS#) and each water quality value is followed by a verification date. The first number of the verification date refers to whether the value is considered a Tier 1 or Tier 2 value. Tier 1 values are calculated using an optimal set of toxicological data while Tier 2 values are calculated using a lesser amount of data (see R323.1057 for further description of tier designation). The next six numbers refer to the year and month that the water quality value was approved for entry into the table.
If a chemical is not listed in the table or if a value is identified with an “ID” (insufficient data) or “NLS” (no literature search), then final values have not been derived. Due to limited resources, values will only be derived in response to requests made by department staff. This list will be updated as necessary to include new or revised values.
Download Rule 57 Water Quality Values spreadsheet
II. Site-specific Rule 57 Water Quality Values
Rule 323.1057(2)(r) of the Part 4. Water Quality Standards gives procedures for deriving site-specific aquatic life values to be more or less stringent to reflect local environmental conditions. The following documents contain the site-specific aquatic life water quality values that have been derived for copper for select streams in the Upper Peninsula of Michigan, and supplemental information used in deriving the criteria.
Information Contact: Dennis Bush, 517-284-5522, or bushD6@michigan.gov