303(d) Disclaimer

Section 303(d) of the 1972 Clean Water Act requires states, tribes and territories to develop lists of impaired waters. Impaired waters are those not meeting water quality standards, including both water quality criteria for specific substances or designated uses (those uses which are codified in water quality standards regulations, i.e. NR 104, Wis. Adm. Code). Each state is required to submit a 303(d) list every two years. The next list will be submitted in 2006. The current spatial dataset reflects the 2004 listing.

Any information listed under the Impact and pollutant categories (Contaminated Sediment, Atmospheric Deposition, Habitat, Non-Point Source, NPS/PS Blend, and Other Factors) should be considered preliminary in nature. Future revisions may occur as information on the list is verified by DNR staff in the regional offices.
Users of this data should be cautioned to independently verify the data before using it in a decision-making process