Nambe Pueblo
Community water system in New Mexico, serving 800 people from ground water. 4 rules violated in the past three years. Owned by tribal 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
Stage 2 Disinfectants and Disinfection Byproducts Rule
Monitoring and Reporting
2 violations, Aug 2025 to Aug 2025 · 2 contaminants
Stage 2 Disinfectants and Disinfection Byproducts Rule
Monitoring and Reporting2 violations, Aug 2025 to Aug 2025 · 2 contaminants
Monitoring and Reporting: 2 violations, Aug 2025 to Aug 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.
Contaminants on the record: Total Haloacetic Acids (HAA5), TTHM (Total Trihalomethanes).
Arsenic Rule
Maximum Contaminant Level ViolationMonitoring and Reporting
Health-based
5 violations, Oct 2023 to Jun 2025 · 4 measured values
Arsenic Rule
Maximum Contaminant Level ViolationMonitoring and Reporting Health-based5 violations, Oct 2023 to Jun 2025 · 4 measured values
Maximum Contaminant Level Violation, health-based: 4 violations, Oct 2023 to Jun 2025. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Monitoring and Reporting: 1 violation, Jan 2025 to Apr 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.
Jan to Mar 2025
Oct to Dec 2024
Jul to Aug 2024
Oct 2023
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
Inorganic Chemicals
Monitoring and Reporting
1 violation, Jan 2017 to Mar 2026 · Fluoride
Inorganic Chemicals
Monitoring and Reporting1 violation, Jan 2017 to Mar 2026 · Fluoride
Monitoring and Reporting: 1 violation, Jan 2017 to Mar 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: Fluoride.
Radionuclides and Revised Rad Rule
Maximum Contaminant Level ViolationMonitoring and Reporting
Health-based
3 violations, Oct 2023 to Mar 2025 · Combined Uranium · 2 measured values
Radionuclides and Revised Rad Rule
Maximum Contaminant Level ViolationMonitoring and Reporting Health-based3 violations, Oct 2023 to Mar 2025 · Combined Uranium · 2 measured values
Maximum Contaminant Level Violation, health-based: 2 violations, Oct 2023 to Sep 2024. A sample exceeded the maximum contaminant level EPA allows in drinking water.
Monitoring and Reporting: 1 violation, Jan 2025 to Mar 2025. The system did not complete required monitoring, or did not report the results on time. This does not show that a contaminant was found.
Jul to Sep 2024
Oct 2023
Contaminant on the record: Combined 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)
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 2020 to Dec 2022
Action level 1.3 mg/L · Jan to Jun 2000
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: Random Forest method, Federal 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.