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EPA SDWIS

Thallium, Total in Drinking Water

8,780 public water systems carry at least one Thallium, Total violation - wide footprint (> 8,691 systems).

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EPA contaminant code: 1085

Total Violations
35,856
Systems Affected
8,780
Health-Based %
0.8%
Violations / System
4.1

Thallium, Total standing, mid-volume SDWIS third

Thallium, Total lands in the middle third by violation volume (35,856), large enough for peer comparisons but not one of the handful of analytes that dominate the fleet-wide SDWIS ledger. Load sits mid-pack at 4.1 violations per affected system (mid load (≤ 5.8 violations per affected system)). Health-based share is only 0.8% - almost all of this analyte's trail is monitoring/reporting rather than MCL exceedance. Among 157 indexable contaminants, this page is #77 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

Beryllium, Total (35,455) 1,2-DIBROMO-3-CHLOROPROPANE (36,389) Antimony, Total (36,416) Total Polychlorinated Biphenyls (PCB) (36,672)

Nearest by systems affected

Simazine (8,903 systems) Pentachlorophenol (8,602 systems) LASSO (9,044 systems) Chlordane (8,465 systems)

Thallium, Total: mixed health vs monitoring split

0.8% health-based · 99.2% monitoring/reporting across 35,856 records.

Health-based (0.8%) Monitoring/Reporting (99.2%)

Most Affected Water Systems

System State Violations Population
Ridgefield Public Works WA 113 20,967
PA American Audubon PA 76 8,200
Seven Estates TX 67 189
Bonnie Plants - Nebo Station NC 64 50
Coal Mountain Water WV 56 80
Franklin Water Systems 3 TX 51 201
Hiawatha Water WV 51 63
Washington Township Mua NJ 48 48,000
Nottingham Manor M H Court PA 48 473
Shrewsbury Borough PA 48 4,727
Oro Valley Water Utility AZ 44 42,316
Culvers Hill - North Webster IN 40 75
Mount Eagle Water Assoc PA 40 130
Pinnacle Water Association WV 39 85
Happy Camper RV Park CO 37 40
Creekside South Estates Metro District CO 36 160
Burlington City Of CO 36 3,720
Windmill Estates IL 36 65
Carmel Montessori Academy IL 36 40
South Bend Water Department WA 36 2,930
East Cherry Creek Valley WSD CO 34 66,130
Paint Brush Hills CO 34 4,994
Willow Springs MHP IN 34 25
Deerfield Park S/D NC 33 440
Mother Teresa Catholic Academy IL 32 220
North Panola Water District MS 32 1,500
Hilltop Village Association PA 32 86
Far Away Auburn PA 32 25
Akhiok AK 31 90
West Roosevelt Mobile Home Park TX 31 95

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.