Dona Ana Mdwca
Community water system in Dona Ana, Doña Ana County, New Mexico, serving 16,987 people from ground water. 4 rules violated in the past three years, 2 still unresolved. Owned by local government.
Quarterly compliance history
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
2026
Currently in violation
EPA data updated Oct 7, 2026
Ground Water Rule
Monitoring and ReportingTreatment Technique Violation
Health-based
11 violations, May 2024 to open · 2 contaminants
Ground Water Rule
Monitoring and ReportingTreatment Technique Violation Health-based11 violations, May 2024 to open · 2 contaminants
Monitoring and Reporting: 1 violation, open since Jun 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.
Treatment Technique Violation, health-based: 10 violations, May 2024 to Aug 2024. The system did not carry out a required treatment process or corrective action.
Contaminants on the record: Groundwater Rule (GWR), E. coli (Escherichia coli).
Groundwater Rule (GWR), health effects: Protects against enteric viruses, which can contaminate groundwater via cracked well casings, failing septic systems, or animal waste. Viruses persist longer in groundwater than in surface water. Hepatitis A and norovirus are the primary pathogens of concern. Limit: Treatment technique: 4-log virus treatment required when source water has fecal indicators or significant sanitary deficiencies
E. coli (Escherichia coli), health effects: Most E. coli strains cause diarrheal illness. Some strains (e.g., O157:H7) produce toxins causing severe bloody diarrhea, hemolytic uremic syndrome (HUS — a form of kidney failure), and death — especially in children under 5 and the elderly. Even non-pathogenic strains in drinking water indicate that disease-causing organisms may also be present. Limit: Zero (one confirmed positive sample = acute MCL violation)
Public Notice Rule and Revised PN Rule
Other Violation
5 violations, Apr 2022 to open · Public Notification Rule
Public Notice Rule and Revised PN Rule
Other Violation5 violations, Apr 2022 to open · Public Notification Rule
Other Violation: 5 violations, 1 still open, Apr 2022 to open. 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 2023 to Apr 2024 · Chlorine (MRDL)
Stage 1 Disinfectants and Disinfection Byproducts Rule
Monitoring and Reporting2 violations, Jul 2023 to Apr 2024 · Chlorine (MRDL)
Monitoring and Reporting: 2 violations, Jul 2023 to Apr 2024. 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).
Radionuclides and Revised Rad Rule
Maximum Contaminant Level ViolationMonitoring and Reporting
Health-based
6 violations, Oct 2025 to Jun 2026 · 3 contaminants · 3 measured values
Radionuclides and Revised Rad Rule
Maximum Contaminant Level ViolationMonitoring and Reporting Health-based6 violations, Oct 2025 to Jun 2026 · 3 contaminants · 3 measured values
Maximum Contaminant Level Violation, health-based: 3 violations, Oct 2025 to Jun 2026. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Monitoring and Reporting: 3 violations, Jan 2026 to Jun 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.
Limit 30 UG/L · Apr to Jun 2026
Limit 30 UG/L · Jan to Mar 2026
Limit 30 UG/L · Oct to Dec 2025
Contaminants on the record: Gross Alpha, Excl. Radon and U, Combined Uranium, Combined Radium (-226 and -228).
Gross Alpha, Excl. Radon and U, health effects: Alpha-emitting radionuclides accumulate in bone and soft tissue, delivering sustained internal radiation doses that increase lifetime cancer risk. There is no established safe threshold for ionizing radiation. Individual contributors such as radium-226 and polonium-210 have their own MCLs; gross alpha serves as a cost-effective screening tool that triggers more specific radionuclide analysis when exceeded. Limit: 15 pCi/L (excluding radon and uranium)
Combined Uranium, health effects: Uranium poses both radiological and chemical health risks. Chronic exposure is primarily associated with kidney damage due to its chemical toxicity as a heavy metal. The radiological risk — increased cancer probability — is also present but secondary to the nephrotoxic concern at drinking water concentrations. There is no safe threshold for radiation exposure. Limit: 0.030 mg/L (30 µg/L)
Combined Radium (-226 and -228), health effects: Radium is a bone-seeking radionuclide that accumulates in skeletal tissue after ingestion. Long-term exposure increases the risk of bone cancer and leukemia. There is no safe threshold for ionizing radiation — the MCL is set at a level balancing risk reduction with treatment feasibility. Children are particularly vulnerable due to higher rates of bone growth and calcium uptake. Limit: 5 pCi/L (combined Ra-226 and Ra-228)
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 2023 to Dec 2025
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 New Mexico 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.