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EPA SDWIS High-volume analyte Dense per-system load

Nitrate-Nitrite in Drinking Water

9.1 violations per affected system (52,447 across 5,756) - dense load (> 5.8 violations per affected system).

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EPA contaminant code: 1038

Total Violations
52,447
Systems Affected
5,756
Health-Based %
35.7%
Violations / System
9.1

Nitrate-Nitrite standing, high-volume SDWIS third

Nitrate-Nitrite sits in the upper third of this extract by raw violation count (52,447), 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: 9.1 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 35.7% - a material slice of the record is exposure-relevant, with the rest monitoring or reporting. Among 157 indexable contaminants, this page is #45 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

Selenium (52,594) Atrazine (52,999) Barium (50,993) BHC-GAMMA (50,797)

Nearest by systems affected

Diquat (5,771 systems) Surface Water Treatment Rule (6,127 systems) Endothall (5,163 systems) Combined Radium (-226 and -228) (6,396 systems)

Nitrate-Nitrite: mixed health vs monitoring split

35.7% health-based · 64.3% monitoring/reporting across 52,447 records.

Health-based (35.7%) Monitoring/Reporting (64.3%)

Most Affected Water Systems

System State Violations Population
Canadian Co RWD # 1 OK 747 750
Okarche OK 727 1,110
North Blaine Water Corp OK 550 960
Hollis OK 545 2,264
Aline OK 543 214
Major County RWD #1 OK 531 1,000
Okarche RWD, Inc OK 513 250
Grandfield OK 414 1,110
King Ranch Colony MT 382 56
Edgar, City Of NE 376 428
Logan Co RWD #2 OK 342 1,146
Carmen Public Works Authority OK 332 355
Loyal OK 331 81
Geary OK 316 1,258
Mooreland OK 284 1,226
Thirsty Water Corp OK 211 81
Unl-Eastern Nebr Resrch & Extension Cntr NE 203 200
Steele City, Village Of NE 175 60
US Gypsum OK 168 280
Eastside MHP OK 164 32
Prosser, Village Of NE 161 76
Mars Petcare US Dba the Iams Company NE 155 240
Cleo Springs OK 152 326
Waterhole Saloon Reedpoint MT 149 25
Rapelje Water District MT 142 70
Belden, Village Of NE 141 112
Homestead Water Company NM 140 222
Humboldt, City Of NE 134 950
Canute OK 133 524
Akal Travel Center NE 122 593

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.