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EPA SDWIS Majority health-based Dense per-system load

Stage 1 Disinfectants and Disinfection Byproducts Rule in Drinking Water

100% of 8,248 recorded violations are health-based - 1,347 systems in the EPA SDWIS extract.

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EPA contaminant code: 0400

Total Violations
8,248
Systems Affected
1,347
Health-Based %
100%
Violations / System
6.1

Stage 1 Disinfectants and Disinfection Byproducts Rule standing, mid-volume SDWIS third

Stage 1 Disinfectants and Disinfection Byproducts Rule lands in the middle third by violation volume (8,248), large enough for peer comparisons but not one of the handful of analytes that dominate the fleet-wide SDWIS ledger. Load is concentrated: 6.1 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 100% - most of this analyte's ledger is MCL or treatment-technique exceedance, not paperwork. Among 157 indexable contaminants, this page is #91 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

Long Term 2 Enhanced Surface Water Treatment Rule (9,010) Asbestos (9,315) Gross Beta Particle Activity (3,274) Chlorite (3,255)

Nearest by systems affected

Stage 2 Disinfectants and Disinfection Byproducts Rule (1,237 systems) CARBON, TOTAL (1,521 systems) COLIPHAGE (601 systems) Chloramine (310 systems)

Stage 1 Disinfectants and Disinfection Byproducts Rule: mostly health-based findings

100% health-based · 0.0% monitoring/reporting across 8,248 records.

Health-based (100%) Monitoring/Reporting (0.0%)

Most Affected Water Systems

System State Violations Population
Pickens Waterworks AR 162 49
Compton Waterworks AR 154 990
Fouke Waterworks AR 129 955
Leisure Hills Mobile Home Park AR 110 113
Watson Waterworks AR 109 166
Cave Springs Waterworks AR 105 5,365
Swifton Waterworks AR 105 1,013
Danville Waterworks AR 104 2,810
Deer Water Association AR 103 938
Deer Run Water Company AR 101 119
Horatio Waterworks AR 97 1,278
Dermott Waterworks AR 94 2,604
Oden-Pencil Bluff Water Assn AR 89 393
Humphrey Waterworks AR 87 602
West Helena Water Works AR 80 5,693
Helena Water Sewer AR 77 2,708
Banks Waterworks AR 74 244
Hartford Waterworks AR 66 725
Lead Hill Waterworks AR 65 525
Walker Water Association AR 64 1,182
Clarendon Waterworks AR 64 1,320
Aiken City of (0210001) SC 64 45,090
Diamond City Water AR 59 1,290
Hosanna Heights Water AR 58 52
Ark St Park-Queen Wilhelmina AR 56 223
Cottonshed Waterworks AR 52 62
Joiner Rural Water AR 48 343
Delight Waterworks AR 46 1,577
Greenway Waterworks AR 43 322
Taylor Waterworks AR 42 566

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.