Swenson WSC
Community water system in Stonewall County, Texas, serving 49 people from surface water purchased. 5 rules violated in the past three years, 1 still unresolved. Owned by local government.
Quarterly compliance history
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
Still in violation
EPA data updated Oct 7, 2026
Public Notice Rule and Revised PN Rule
Other Violation
1 violation, Mar 2008 to open · Public Notification Rule
Public Notice Rule and Revised PN Rule
Other Violation1 violation, Mar 2008 to open · Public Notification Rule
Other Violation: 1 violation, open since Mar 2008. A requirement other than monitoring, reporting, or a contaminant limit, such as public notice or the annual water quality report.
Contaminant on the record: Public Notification Rule.
Also violated in the past three years
Jul to Sep 2023 to Jul to Sep 2026
Stage 1 Disinfectants and Disinfection Byproducts Rule
Monitoring and Reporting
2 violations, Jul 2024 to May 2026 · Chlorine (MRDL)
Stage 1 Disinfectants and Disinfection Byproducts Rule
Monitoring and Reporting2 violations, Jul 2024 to May 2026 · Chlorine (MRDL)
Monitoring and Reporting: 2 violations, Jul 2024 to May 2026. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.
Contaminant on the record: Chlorine (MRDL).
Stage 2 Disinfectants and Disinfection Byproducts Rule
Maximum Contaminant Level Violation
Health-based
5 violations, Apr 2025 to Jun 2026 · TTHM (Total Trihalomethanes) · 5 measured values
Stage 2 Disinfectants and Disinfection Byproducts Rule
Maximum Contaminant Level Violation Health-based5 violations, Apr 2025 to Jun 2026 · TTHM (Total Trihalomethanes) · 5 measured values
Maximum Contaminant Level Violation, health-based: 5 violations, Apr 2025 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 0.08 MG/L · Apr to Jun 2026
Limit 0.08 MG/L · Jan to Mar 2026
Limit 0.08 MG/L · Oct to Dec 2025
Limit 0.08 MG/L · Jul to Sep 2025
Limit 0.08 MG/L · Apr to Jun 2025
Contaminant on the record: TTHM (Total Trihalomethanes).
TTHM (Total Trihalomethanes), health effects: Long-term exposure is associated with increased bladder cancer risk. Some studies link high TTHM exposure to adverse reproductive outcomes. Bromodichloromethane is classified as a possible human carcinogen. Limit: 0.080 mg/L (80 ppb) locational running annual average (LRAA)
Nitrate Rule
Maximum Contaminant Level Violation
Health-based
1 violation, Apr 2026 to Jun 2026 · 12 MG/L
Nitrate Rule
Maximum Contaminant Level Violation Health-based1 violation, Apr 2026 to Jun 2026 · 12 MG/L
Maximum Contaminant Level Violation, health-based: 1 violation, Apr 2026 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 10 MG/L · Apr to Jun 2026
What the rule requires: Nitrate (NO₃) is the most common chemical contaminant in US groundwater, entering from fertilizers, septic systems, and animal waste. It is odorless and tasteless — the only way to know if it's present is to test.
Health effects: Methemoglobinemia in infants under 6 months: gut bacteria convert nitrate to nitrite, which blocks oxygen transport in blood. Pregnant women should also take precautions. Chronic adult exposure at elevated levels may increase cancer risk. Limit: 10 mg/L as nitrogen (NO₃-N)
About this rule
Lead and Copper Rule Revisions
Reporting ViolationTreatment Technique Violation
Health-based
2 violations, Oct 2024 to Apr 2025
Lead and Copper Rule Revisions
Reporting ViolationTreatment Technique Violation Health-based2 violations, Oct 2024 to Apr 2025
Treatment Technique Violation, health-based: 1 violation, Oct 2024 to Apr 2025. The system did not carry out a required treatment process or corrective action.
Reporting Violation: 1 violation, Oct 2024 to Apr 2025. The system did not report required information on time.
What the rule requires: The 2021 LCRR updated the 1991 LCR with mandatory lead service line inventories and replacement planning, a new 'trigger level' at 10 ppb requiring optimization, and strengthened public education. The 2024 Lead and Copper Rule Improvements (LCRI) further requires replacing all lead service lines within 10 years.
Health effects: Same as Lead and Copper Rule (5000). Violations typically reflect failure to complete the required lead service line inventory or submit a required replacement plan. Lead service lines are the primary source of lead at the tap in many older systems. Limit: Lead action level: 15 ppb (trigger level: 10 ppb); copper action level: 1.3 mg/L
About this ruleLead and copper at the tap
The 90th percentile of the tap samples the system collected in its latest monitoring period, against EPA's action level. Levels vary between homes.
Action level 0.015 mg/L · Jan 2022 to Dec 2024
About this data
Rules violated and the list above come from EPA's SDWIS violation records, one row per violation and contaminant, grouped by the rule each row belongs to. A violation counts when its non-compliance period ended on or after Jul 1, 2023, the start of the thirteen quarters ECHO's three-year figures cover, or is still open; it is unresolved when it was still open at EPA's data refresh on Oct 7, 2026. EPA's rule code 500, "Not Regulated", is left out, as in ECHO's counts. Each rule's violation count is EPA's, and one rule can carry several: a missed monitoring round for a group of contaminants is one violation per contaminant and period. Category names are EPA's violation categories.
ECHO's own summary count of rules violated agrees with this grouping for 98.8% of active systems nationally, and its count of rules being violated for 98.7%; where they differ, the figures here follow the rows listed.
A measured value shown with a rule is the sample result EPA recorded with that violation (SDWIS viol_measure), against the limit EPA recorded on the same row (state_mcl), both in EPA's unit as written; violations without a recorded value, such as missed monitoring, show none. Other measured contaminant levels are not part of this record; each system publishes them in its annual Consumer Confidence Report.
Lead and copper are the newest 90th-percentile results in EPA's SDWA data download (LCR_SAMPLES, codes PB90 and CU90), retrieved on Oct 12, 2026: for each monitoring period a system reports the 90th-percentile value of its tap samples, which EPA compares with its action level of 0.015 mg/L for lead and 1.3 mg/L for copper (40 CFR 141.80). A result is not a measurement of any one tap.
Service area from EPA's Public Water System Service Area Boundaries dataset: State Agency. The system's location is the centre of the service area EPA publishes for the system.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The Texas records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.