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EPA SDWIS High-volume analyte Dense per-system load

Lead and Copper Rule in Drinking Water

7.7 violations per affected system (316,481 across 41,280) - dense load (> 5.8 violations per affected system).

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EPA contaminant code: 5000

Total Violations
316,481
Systems Affected
41,280
Health-Based %
8.2%
Violations / System
7.7

Lead and Copper Rule standing, high-volume SDWIS third

Lead and Copper Rule sits in the upper third of this extract by raw violation count (316,481), 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: 7.7 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 only 8.2% - almost all of this analyte's trail is monitoring/reporting rather than MCL exceedance. Among 157 indexable contaminants, this page is #6 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

Public Notice (326,526) TTHM (327,560) Total Haloacetic Acids (HAA5) (208,475) Consumer Confidence Rule (201,666)

Nearest by systems affected

Nitrate (60,497 systems) Revised Total Coliform Rule (60,574 systems) E. COLI (17,344 systems) Arsenic (16,264 systems)

Lead and Copper Rule: mixed health vs monitoring split

8.2% health-based · 91.8% monitoring/reporting across 316,481 records.

Health-based (8.2%) Monitoring/Reporting (91.8%)

Most Affected Water Systems

System State Violations Population
Circle H MHP NC 223 68
Darby Town Of MT 201 850
Key Largo Utilities TX 196 105
Four Corners Business Park MT 195 200
Boulder City Of MT 193 1,400
Coal Mountain Water WV 189 80
Crystal Springs Water System MT 186 225
Turner Colony MT 182 50
Willow Springs MHP IN 178 25
Rau School District No 21 MT 170 80
Super One Food Store MT 163 1,769
Sunshine Academy Laurel MT 158 65
Ryegate Town Of MT 156 270
Llano Grande Lake Park West TX 148 300
Hiawatha Water WV 147 63
Juniper Hills Ranch NM 144 65
Klondike Isd TX 142 311
Whitewater Park Assoc Bonner MT 138 25
Imagination Station Academy, LLC NC 133 35
Basin County Water and Sewer Dist MT 131 200
Pioneer School Dist 41 MT 129 70
Whitewater School Dist 20Aa D MT 128 125
Caro WSC TX 128 2,412
Loving County Water System TX 121 165
Golden Eagle Water Users Assn MT 120 125
Glendale WSC TX 119 1,458
Village of Surfside Beach TX 118 5,697
Lago Vista Water System TX 118 72
Pinnacle Water Association WV 118 85
City of Ranger TX 117 2,629

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.