Welch WSC
Community water system in Dawson County, Texas, serving 315 people from ground water. 3 rules violated in the past three years. Owned by local government.
Quarterly compliance history
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
Rules violated in the past three years
Jul to Sep 2023 to Jul to Sep 2026
Arsenic Rule
Maximum Contaminant Level Violation
Health-based
12 violations, Jul 2023 to Jun 2026 · 12 measured values
Arsenic Rule
Maximum Contaminant Level Violation Health-based12 violations, Jul 2023 to Jun 2026 · 12 measured values
Maximum Contaminant Level Violation, health-based: 12 violations, Jul 2023 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 0.01 MG/L · Apr to Jun 2026
Limit 0.01 MG/L · Jan to Mar 2026
Limit 0.01 MG/L · Oct to Dec 2025
Limit 0.01 MG/L · Jul to Sep 2025
Limit 0.01 MG/L · Apr to Jun 2025
Limit 0.01 MG/L · Jan to Mar 2025
6 more in EPA's record
What the rule requires: Arsenic is a naturally occurring metalloid found in bedrock and soil. It dissolves into groundwater from natural deposits and can also come from mining, smelting and past pesticide use. EPA lowered the MCL from 50 ppb to 10 ppb in 2001.
Health effects: Long-term arsenic exposure increases risk of bladder, lung, and skin cancers. It is also associated with cardiovascular disease, type 2 diabetes, and developmental effects in children. Arsenic is classified as a Group A human carcinogen by the EPA. Limit: 0.010 mg/L (10 ppb), set in 2001 and enforceable since 2006; the previous MCL was 0.050 mg/L (50 ppb)
About this rule
Nitrate Rule
Maximum Contaminant Level Violation
Health-based
3 violations, Jul 2023 to Feb 2025 · 3 measured values
Nitrate Rule
Maximum Contaminant Level Violation Health-based3 violations, Jul 2023 to Feb 2025 · 3 measured values
Maximum Contaminant Level Violation, health-based: 3 violations, Jul 2023 to Feb 2025. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Limit 10 MG/L · Jul to Sep 2024
Limit 10 MG/L · Jan to Mar 2024
Limit 10 MG/L · Jul to Sep 2023
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
Public Notice Rule and Revised PN Rule
Other Violation
1 violation, Jul 2023 to Aug 2023 · Public Notification Rule
Public Notice Rule and Revised PN Rule
Other Violation1 violation, Jul 2023 to Aug 2023 · Public Notification Rule
Other Violation: 1 violation, Jul 2023 to Aug 2023. 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.
Lead 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 to Dec 2023
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): 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.