How many water systems have Long Term 2 Enhanced Surface Water Treatment Rule violations?

871 systems sit in the mid footprint band (mid footprint (≤ 8,691 systems)).

Are Long Term 2 Enhanced Surface Water Treatment Rule violations dangerous?

Yes in EPA terms for most of this ledger: 83.6% are health-based (MCL or treatment-technique). Those trigger corrective action and public notice.

Where does Long Term 2 Enhanced Surface Water Treatment Rule sit in the national contaminant ledger?

#90 of 157 indexable contaminants by violation volume - middle-third volume (≤ 49,133 violations), dense load (> 5.8 violations per affected system).

Where does this contaminant data come from?

EPA Safe Drinking Water Information System (SDWIS) quarterly extracts. Counts are cumulative compliance records, not a live risk score for a single tap.

Contaminants →

EPA SDWIS Majority health-based Dense per-system load

Long Term 2 Enhanced Surface Water Treatment Rule in Drinking Water

Q: What is Long Term 2 Enhanced Surface Water Treatment Rule in drinking water?

Long Term 2 Enhanced Surface Water Treatment Rule is an EPA SDWIS analyte. In this extract, 83.6% of its 9,010 violations are health-based across 871 systems.

Compiled by PlainWater · May 15, 2026

83.6% of 9,010 recorded violations are health-based - 871 systems in the EPA SDWIS extract.

Browse all SDWIS contaminants →

EPA contaminant code: 0800

Total Violations

9,010

Systems Affected

871

Health-Based %

83.6%

Violations / System

10.3

Long Term 2 Enhanced Surface Water Treatment Rule standing, mid-volume SDWIS third

Long Term 2 Enhanced Surface Water Treatment Rule lands in the middle third by violation volume (9,010), large enough for peer comparisons but not one of the handful of analytes that dominate the fleet-wide SDWIS ledger. Load is concentrated: 10.3 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 83.6% - most of this analyte's ledger is MCL or treatment-technique exceedance, not paperwork. Among 157 indexable contaminants, this page is #90 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

Asbestos (9,315) Stage 1 Disinfectants and Disinfection Byproducts Rule (8,248) 2,3,7,8-TCDD (14,181) Gross Beta Particle Activity (3,274)

Nearest by systems affected

COLIPHAGE (601 systems) Stage 2 Disinfectants and Disinfection Byproducts Rule (1,237 systems) Chloramine (310 systems) Chlorite (280 systems)

Long Term 2 Enhanced Surface Water Treatment Rule: mostly health-based findings

83.6% health-based · 16.4% monitoring/reporting across 9,010 records.

Health-based (83.6%) Monitoring/Reporting (16.4%)

Most Affected Water Systems

System	State	Violations	Population
Cassie Water System	TX	495	106
Specht Store	TX	288	170
Barksdale WSC	TX	283	279
Gypsy River Resort	TX	263	87
Confluence Boro Muni Auth	PA	262	645
Jicarilla Dulce	06	252	3,064
Denton Town Of	MT	232	255
Seven Hills Ranch	TX	231	801
Duchman Family Winery	TX	188	55
Camp Eagle	TX	185	850
Geo Specialty Chemicals	TX	184	46
Webb County Water Utilities	TX	173	8,358
Crystal Clear Sud	TX	144	20,766
Luquillo Urbano	PR	135	8,880
River Road Camp	TX	129	180
Deerfield	MI	128	943
City of Groesbeck	TX	112	4,250
Alto Frio Baptist Encampment	TX	110	750
Wagoner Co. RWD #4	OK	108	25,792
D Bar B Mobile Home Ranch	TX	104	267
Lake Erie Utilities Company	OH	90	400
Nowata Municipal Authority	OK	78	3,971
Criders on the Frio	TX	74	100
City of Pflugerville	TX	73	63,464
Poplar Bluff PWS	MO	72	17,043
Nowata Municipal Authority	OK	72	3,971
Metlakatla	10	66	1,575
Las Bocas	PR	65	10,998
Kickapoo Tribal Waterworks	07	62	520
Cubuy Maizales	PR	59	617

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.