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EPA SDWIS High-volume analyte

Nitrite in Drinking Water

13,772 public water systems carry at least one Nitrite violation - wide footprint (> 8,691 systems).

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EPA contaminant code: 1041

Total Violations
72,418
Systems Affected
13,772
Health-Based %
2.2%
Violations / System
5.3

Nitrite standing, high-volume SDWIS third

Nitrite sits in the upper third of this extract by raw violation count (72,418), 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 sits mid-pack at 5.3 violations per affected system (mid load (≤ 5.8 violations per affected system)). Health-based share is only 2.2% - almost all of this analyte's trail is monitoring/reporting rather than MCL exceedance. Among 157 indexable contaminants, this page is #41 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

Interim Enhanced Surface Water Treatment Rule (72,147) Vinyl chloride (76,766) Fluoride (78,347) Xylenes, Total (79,013)

Nearest by systems affected

Selenium (13,645 systems) Cadmium (13,518 systems) Barium (13,488 systems) Mercury (13,488 systems)

Nitrite: mixed health vs monitoring split

2.2% health-based · 97.8% monitoring/reporting across 72,418 records.

Health-based (2.2%) Monitoring/Reporting (97.8%)

Most Affected Water Systems

System State Violations Population
Churdan Water Supply IA 727 375
Robinwood Village PA 130 70
Reflection Lakes PA 123 600
Scottyland USA PA 122 200
Elk Mountain Ski Resort PA 121 1,000
Bella Roma Pizza PA 116 300
Nottingham Manor M H Court PA 115 473
Key Road Subdivision Water System TX 110 54
Spruce Lake Retreat Wldrns Cmp PA 100 900
Lee Limas Mobile Home Park TX 94 39
Seven Ts Pizza PA 93 150
Camp Lavigne PA 91 150
Springton Manor Farm PA 87 200
Beaver Springs Dragways PA 86 500
Rock Creek Mh Village No 2 NC 84 305
Tyler State Park PA 83 100
Wellman Municipal Waterworks IA 79 1,524
Maritime Farms South China ME 79 25
Chrisman IL 78 1,200
Lightstreet Hotel PA 76 25
Hughesville Camp Meeting PA 76 25
Hidden Valley Camping Resort PA 76 600
Pb Guide Service ME 73 40
West Shore Development ME 69 50
Canyon Country Campground PA 69 60
Union Grove Baptist Church NC 66 30
Milton Jellyston Park PA 64 150
Stewartstown Boro Water Auth PA 62 5,206
Knobley Farm WV 61 25
Genesee Twp Water Authority PA 60 450

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.