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States → New Mexico

Non-Transient Non-Community Water System · PWS NM3593629

Chevron Mining Inc Questa Mine

Questa, New Mexico 87556 - drinking water served from groundwater sources to 300 people, tracked in EPA SDWIS and UCMR5.

300
People served
978
EPA violations
99
Health-based
Untested
UCMR5 result

The verdict

EPA records 978 drinking-water violations at Chevron Mining Inc Questa Mine, 10% of them health-based - above the New Mexico per-system average.

978
Total EPA violations on record
10%
Health-based (MCL / treatment failure)
300
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Chevron Mining Inc Questa Mine

Chevron Mining Inc Questa Mine is a private-owned non-transient non-community water system that delivers drinking water to 300 residents in Questa, New Mexico (Taos County) through 23 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 978 total violations for this system , of which 99 (10%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 863 monitoring and reporting violations are on file. The most recent violation on record dates to 2020.

The most frequently cited contaminant at this system is Nickel, recorded in 24 violations (MCL, health-based). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across New Mexico, EPA tracks 1,037 public water systems serving 2,027,497 people, with 154,522 cumulative violations and 38,650 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 149 violations. Statewide, 70 of 72 UCMR5-tested systems have reported PFAS detections (97.2%).

Chevron Mining Inc Questa Mine's 978 violations sit above the New Mexico average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
300
Total Violations
978
Health-Based Violations
99
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Private
Connections
23
County
Taos
School/Daycare
No
MCL Violations
99
Monitoring Violations
863
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Nickel MCL 24 2004
Beryllium, Total MCL 23 2004
Cadmium MCL 23 2004
Toxaphene MR 16 2006
Dalapon MR 16 2006
Diquat MR 16 2006
Di(2-ethylhexyl) adipate MR 16 2006
Simazine MR 16 2006
Dinoseb MR 16 2006
Hexachlorocyclopentadiene MR 16 2006
Aldicarb MR 16 2006
Atrazine MR 16 2006
Heptachlor epoxide MR 16 2006
2,4,5-TP MR 16 2006
ETHYLENE DIBROMIDE MR 16 2006
Endrin MR 16 2006
BHC-GAMMA MR 16 2006
Methoxychlor MR 16 2006
Endothall MR 16 2006
OXAMYL MR 16 2006
Picloram MR 16 2006
Aldicarb sulfoxide MR 16 2006
Carbofuran MR 16 2006
LASSO MR 16 2006
2,4-D MR 16 2006
HEXACHLOROBENZENE MR 16 2006
Benzo(a)pyrene MR 16 2006
Pentachlorophenol MR 16 2006
1,2-DIBROMO-3-CHLOROPROPANE MR 16 2006
Chlordane MR 16 2006

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Chevron Mining Inc Questa Mine.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID NM3593629 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

New Mexico Drinking Water Authority

New Mexico's primacy agency administers the Safe Drinking Water Act locally. Search EPA SDWIS for the current state contact, or use the state's public health or environment department portal.

Find NM regulator via EPA SDWIS

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2020 Chlorine MR 4 SDWIS / NM3593629 / 0999
2016 Revised Total Coliform Rule MON 4 SDWIS / NM3593629 / 8000
2015 Coliform (TCR) MR 11 SDWIS / NM3593629 / 3100
2011 Public Notice Other 3 SDWIS / NM3593629 / 7500
2009 Coliform (TCR) MCL 15 SDWIS / NM3593629 / 3100
2006 Toxaphene MR 16 SDWIS / NM3593629 / 2020
2006 Dalapon MR 16 SDWIS / NM3593629 / 2031
2006 Diquat MR 16 SDWIS / NM3593629 / 2032
2006 Di(2-ethylhexyl) adipate MR 16 SDWIS / NM3593629 / 2035
2006 Simazine MR 16 SDWIS / NM3593629 / 2037
2006 Dinoseb MR 16 SDWIS / NM3593629 / 2041
2006 Hexachlorocyclopentadiene MR 16 SDWIS / NM3593629 / 2042
2006 Aldicarb MR 16 SDWIS / NM3593629 / 2047
2006 Atrazine MR 16 SDWIS / NM3593629 / 2050
2006 Heptachlor epoxide MR 16 SDWIS / NM3593629 / 2067

How Chevron Mining Inc Questa Mine Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Chevron Mining Inc Questa Mine New Mexico avg Federal benchmark
Total violations 978 149 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 99 37.3 Indicates a contaminant exceeded a federal MCL
PFAS detection None 97.2% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 300 1,955 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 1,037 regulated public water systems in New Mexico.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Chevron Mining Inc Questa Mine water safe to drink? ▼
Chevron Mining Inc Questa Mine (PWS ID: NM3593629) has 978 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 300 people using Groundwater sources.
How many people does Chevron Mining Inc Questa Mine serve? ▼
Chevron Mining Inc Questa Mine serves 300 people in Questa, New Mexico. It is a Private-owned system using Groundwater water sources with 23 service connections.
What type of violations does Chevron Mining Inc Questa Mine have? ▼
Chevron Mining Inc Questa Mine has 978 total violations: 99 health-based violations (MCL exceedances or treatment failures), 863 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Chevron Mining Inc Questa Mine water? ▼
No PFAS testing data is available for Chevron Mining Inc Questa Mine under the EPA's UCMR5 monitoring program.
What water source does Chevron Mining Inc Questa Mine use? ▼
Chevron Mining Inc Questa Mine uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from 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.