Water Discharge Data — Searchable and Tracked

Facilities report what they discharge into rivers, streams, and waterways under NPDES (National Pollutant Discharge Elimination System) permits. We make those public records searchable and show when reported values exceed permit limits — known as exceedances. Subscribe to email digests for specific facilities, counties, or parameters.

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Illinois, Pennsylvania, Texas, and Virginia discharge monitoring data

7,359

Permits Tracked

136,566

Limit Exceedances

244

Parameters Monitored

Permits, exceedances, and parameters are counted through each state's primary source. A search can return more permits than shown here, because it also includes permits that appear only in the federal feed. How these counts are scoped.

Illinois 30,850 · Pennsylvania 41,207 · Texas 53,750 · Virginia 10,759

Pennsylvania data comes from the state agency's monitoring system; Illinois, Texas, and Virginia from the federal discharge-monitoring feed, which carries less facility detail. See Methodology for sources.

Standard coverage includes monitoring periods from the most recent 5 years — currently January 2021 through August 2026. Older records are retained but not shown by default.

Data Disclaimer: Permit Minder reformats publicly available discharge monitoring report (DMR) data self-reported by permitted facilities to their permitting authority. The appearance of a record does not indicate any regulatory determination. Exceedance data reflects reported values compared to permit limits on file and does not reflect whether any exceedance involved a permitted upset or bypass under 40 CFR 122.41(n)/(m), a variance, consent order, or approved compliance schedule. Permit Minder is independently operated and is not affiliated with EPA or any government agency. If you believe any record is inaccurate, please submit a data correction request.

How It Works

Facilities with NPDES permits are required to self-report discharge monitoring data to their permitting authority. When a reported value exceeds the numeric limit in a facility's permit, that's an exceedance. Permit Minder compiles these public records into a searchable database so anyone can find exceedances without digging through state reporting systems.

Search

Search NPDES-permitted facilities by permit number, facility name, county, or discharge parameter. Facility name and county come from the federal facility bundle; where a permit is absent from it, both are shown blank. Receiving stream and facility type are not available for records collected from the federal feed.

Review

See reported discharge values alongside permit limits, with percentage-over-limit calculations for each monitoring period.

Monitor

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