Community Water System · PWS NM3506829
Questa Water System
Operator location Questa, New Mexico - 35% of 141 violations are health-based (upper-third health share (> 23%)); groundwater source; 2,337 served per SDWIS.
- 2,337
- People served (this PWS)
- 141
- EPA violations (this PWS)
- 49
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Questa Water System standing, high SDWIS violation third
35% of 141 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 35% is upper-third health share (> 23%). Population rank #12,459 of 29,740 among systems serving 500+.
The verdict
Questa Water System sits in the upper third of the sitemap cohort by violation count (141), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,337 (mid served population (≤ 3,309)). Health-based share is 35% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #12,459 of 29,740
- Population · /systems
- #88 of 215
- Population · NM
- 141
- Total EPA violations on record
- 35%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 820
- County
- Taos
- School/Daycare
- No
- MCL Violations
- 29
- Monitoring Violations
- 62
- Treatment Tech Violations
- 20
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MCL | 29 | 2011 |
| Groundwater Rule | TT | 20 | 2016 |
| Coliform (TCR) | MR | 14 | 2012 |
| Revised Total Coliform Rule | MON | 12 | 2018 |
| Consumer Confidence Rule | Other | 10 | 2012 |
| Chlorine | MR | 9 | 2012 |
| TTHM | MR | 8 | 2016 |
| Total Haloacetic Acids (HAA5) | MR | 8 | 2016 |
| Lead and Copper Rule | MR | 7 | 2024 |
| E. COLI | MR | 4 | 2018 |
| Public Notice | Other | 4 | 2019 |
| Revised Total Coliform Rule | Other | 4 | 2016 |
Violation Count vs. the National Corpus
Questa Water System has 141 recorded EPA violations, 80% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 20% carry more. 35% of this system's own violations are health-based (49 of 141), and it ranks #12,459 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
141 Higher than most more violations than 80% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
Health-based violations on Questa Water System
49 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NM3506829.
Sources: EPA SDWIS
Nationwide peers
141 violations · 2,337 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Questa Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in New Mexico compares on the same EPA violation measures. New Mexico systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.