Community Water System · PWS NM3509523
Regina Mdwca
Operator location Los Alamos, New Mexico - 46% of 309 violations are health-based (upper-third health share (> 23%)); groundwater source; 705 served per SDWIS.
- 705
- People served (this PWS)
- 309
- EPA violations (this PWS)
- 141
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Regina Mdwca standing, high SDWIS violation third
46% of 309 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 46% is upper-third health share (> 23%). Population rank #24,185 of 29,740 among systems serving 500+.
The verdict
Regina Mdwca sits in the upper third of the sitemap cohort by violation count (309), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (705; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 46% - most of this ledger is MCL or treatment-technique exceedance. No UCMR5 PFAS test appears for this system in this extract.
- #24,185 of 29,740
- Population · /systems
- #177 of 215
- Population · NM
- 309
- Total EPA violations on record
- 46%
- 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
- 260
- County
- Sandoval
- School/Daycare
- No
- MCL Violations
- 9
- Monitoring Violations
- 97
- Treatment Tech Violations
- 132
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Groundwater Rule | TT | 132 | 2024 |
| Revised Total Coliform Rule | MON | 45 | 2017 |
| Public Notice | Other | 21 | 2024 |
| Total Haloacetic Acids (HAA5) | MR | 18 | 2018 |
| TTHM | MR | 18 | 2018 |
| Consumer Confidence Rule | Other | 18 | 2025 |
| Coliform (TCR) | MCL | 9 | 2003 |
| Lead and Copper Rule | MR | 8 | 2016 |
| Coliform (TCR) | MR | 4 | 2015 |
| Revised Total Coliform Rule | Other | 3 | 2016 |
| Asbestos | MR | 3 | 2020 |
| Groundwater Rule | Other | 3 | 2024 |
| Nitrate-Nitrite | MR | 1 | 2005 |
Violation Count vs. the National Corpus
Regina Mdwca has 309 recorded EPA violations, 91% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 9% carry more. 46% of this system's own violations are health-based (141 of 309), and it ranks #24,185 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)
309 Higher than most more violations than 91% 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 Regina Mdwca
141 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for NM3509523.
Sources: EPA SDWIS
Nationwide peers
309 violations · 705 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 with smaller service footprints
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Regina Mdwca
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.