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EPA SDWIS High-volume analyte Dense per-system load

Nitrate in Drinking Water

8.1 violations per affected system (490,545 across 60,497) - dense load (> 5.8 violations per affected system).

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EPA contaminant code: 1040

Total Violations
490,545
Systems Affected
60,497
Health-Based %
16.4%
Violations / System
8.1

Nitrate standing, high-volume SDWIS third

Nitrate sits in the upper third of this extract by raw violation count (490,545), so the national record is thick enough that system-level lists below are a sample of a much larger compliance trail rather than a near-complete inventory. Load is concentrated: 8.1 violations per affected system (dense load (> 5.8 violations per affected system)), which usually means repeat findings on the same PWSIDs rather than one-off detections spread thin. Health-based share is 16.4% - a material slice of the record is exposure-relevant, with the rest monitoring or reporting. Among 157 indexable contaminants, this page is #3 by violation volume. Utilities listed below are ranked by cumulative violation count for this analyte; pair that with population served to gauge household exposure scale.

Nationwide similar contaminants

Nearest by violation volume

TTHM (327,560) Public Notice (326,526) Lead and Copper Rule (316,481) Revised Total Coliform Rule (710,085)

Nearest by systems affected

Consumer Confidence Rule (29,061 systems) Coliform (TCR) (98,293 systems) Total Haloacetic Acids (HAA5) (18,140 systems) E. COLI (17,344 systems)

Nitrate: mixed health vs monitoring split

16.4% health-based · 83.6% monitoring/reporting across 490,545 records.

Health-based (16.4%) Monitoring/Reporting (83.6%)

Most Affected Water Systems

System State Violations Population
Burlington City Of CO 915 3,720
Franklin Water Systems 3 TX 783 201
Franklin Water Systems 3 TX 629 201
Seven Estates TX 621 189
Pretty Prairie, City Of KS 596 655
Welch WSC TX 591 315
Northgate Mobile Home Park 1 TX 588 126
Rra Hinds Wildcat Water System TX 586 228
Eola WSC TX 579 165
Rra Guthrie Dumont Water System TX 527 291
City of Quitaque TX 502 342
Turkey Municipal Water System TX 496 317
Rra Truscott Gilliland Water System TX 451 243
Whitharral WSC TX 443 200
Twin Oaks MHP Midland TX 437 234
Lazy Palms Ranch TX 426 400
City of Roscoe TX 423 1,238
Lubbock RV Park TX 422 150
City of Dodson TX 411 93
Northside WSC TX 394 250
Grassland WSC TX 393 55
Encinal RD WS #01 CA 345 91
Norwich, City Of KS 334 433
Greenwood Terrace M H Subdivision TX 332 120
Grady Isd TX 326 292
Hollis OK 323 2,264
City of Weinert TX 306 162
North Blaine Water Corp OK 300 960
Rra Lockett Water System TX 278 705
Cliffs Place Inc IA 275 51

Context: understanding water quality data · is my water safe?

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the EPA Safe Drinking Water Information System (SDWIS). Consult a qualified professional before making decisions based on this data.

Read our methodology - how this data is sourced, computed, and verified.

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This page draws directly on EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.