Community Water System · PWS AZ0401011
Old Concho Water Users
Operator location Concho, Arizona - smaller served population (≤ 999) at 40 people served; 428 SDWIS violations on record from groundwater sources.
- 40
- People served (this PWS)
- 428
- EPA violations (this PWS)
- 20
- Health-based (this PWS)
- No PFAS
- UCMR5 (this PWS)
Old Concho Water Users standing, high SDWIS violation third
40 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 5% is middle-third health share (≤ 23%). UCMR5: UCMR5 tested, none detected.
The verdict
Old Concho Water Users sits in the upper third of the sitemap cohort by violation count (428), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (40; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 5% (middle-third health share (≤ 23%)). UCMR5 tested this system and reported no PFAS above the minimum reporting level.
- 428
- Total EPA violations on record
- 5%
- Health-based (MCL / treatment failure)
- 40
- People served by this PWS (SDWIS)
- 0
- PFAS compounds detected (UCMR5)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 31
- County
- Apache
- School/Daycare
- No
- MCL Violations
- 20
- Monitoring Violations
- 315
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 80 | 2025 |
| Coliform (TCR) | MR | 52 | 2015 |
| Lead and Copper Rule | MR | 37 | 2024 |
| Revised Total Coliform Rule | MON | 36 | 2025 |
| Consumer Confidence Rule | Other | 35 | 2025 |
| TTHM | MR | 28 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 28 | 2025 |
| Coliform (TCR) | MCL | 17 | 2015 |
| Public Notice | Other | 9 | 2024 |
| Revised Total Coliform Rule | RPT | 7 | 2021 |
| E. COLI | MR | 6 | 2016 |
| Gross Alpha, Excl. Radon and U | MR | 5 | 1989 |
| Arsenic | MR | 4 | 1988 |
| Gross Alpha, Excl. Radon and U | MCL | 3 | 1989 |
| Barium | MR | 3 | 1988 |
| Fluoride | MR | 3 | 1988 |
| Nitrate | MR | 3 | 1988 |
| Chromium | MR | 3 | 1988 |
| Selenium | MR | 3 | 1988 |
| Mercury | MR | 3 | 1988 |
| Cadmium | MR | 3 | 1988 |
| 1,1,2-Trichloroethane | MR | 1 | 1987 |
| 1,1-Dichloroethylene | MR | 1 | 1987 |
| Ethylbenzene | MR | 1 | 1987 |
| Carbon tetrachloride | MR | 1 | 1987 |
| DICHLOROMETHANE | MR | 1 | 1987 |
| 1,2-Dichloropropane | MR | 1 | 1987 |
| cis-1,2-Dichloroethylene | MR | 1 | 1987 |
| Benzene | MR | 1 | 1987 |
| trans-1,2-Dichloroethylene | MR | 1 | 1987 |
Violation Count vs. the National Corpus
Old Concho Water Users has 428 recorded EPA violations, 94% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 6% carry more. 5% of this system's own violations are health-based (20 of 428), and it ranks unranked by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
428 Higher than most more violations than 94% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 0 of 29 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFOS | 6/1/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFEESA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 6/1/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 6/1/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 6/1/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 6/1/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFHpS | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 6/1/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFMBA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 6/1/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 6/1/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 6/1/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFDA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 6/1/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBA | 6/1/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFNA | 6/1/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 6/1/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 6/1/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 6/1/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 6/1/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| HFPO-DA | 6/1/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxS | 6/1/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Population served record for Old Concho Water Users
EPA SDWIS lists 40 people served and 31 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
428 violations · 40 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.
What to do with Old Concho Water Users
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Arizona compares on the same EPA violation measures. Arizona 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.