Community Water System · PWS AZ0413025
Cottonwood Municipal Water Cw1
Operator location Cottonwood, Arizona - 47% of 367 violations are health-based (upper-third health share (> 23%)); groundwater source; 11,023 served per SDWIS.
- 11,023
- People served (this PWS)
- 367
- EPA violations (this PWS)
- 173
- Health-based (this PWS)
- 1 PFAS
- UCMR5 (this PWS)
Cottonwood Municipal Water Cw1 standing, high SDWIS violation third
47% of 367 recorded violations are health-based - upper-third health share (> 23%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 47% is upper-third health share (> 23%). UCMR5: lower-third PFAS panel (≤ 2 compounds). Population rank #4,364 of 29,740 among systems serving 500+.
The verdict
Cottonwood Municipal Water Cw1 sits in the upper third of the sitemap cohort by violation count (367), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (11,023; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 47% - most of this ledger is MCL or treatment-technique exceedance. UCMR5 detected 1 PFAS compound (lower-third PFAS panel (≤ 2 compounds)).
- #4,364 of 29,740
- Population · /systems
- #68 of 413
- Population · AZ
- 367
- Total EPA violations on record
- 47%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
1 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Private
- Connections
- 4,409
- County
- Yavapai
- School/Daycare
- No
- MCL Violations
- 173
- Monitoring Violations
- 177
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Arsenic | MCL | 172 | 2021 |
| Arsenic | MR | 35 | 2018 |
| Chlorine | MR | 23 | 2015 |
| Coliform (TCR) | MR | 11 | 2014 |
| Consumer Confidence Rule | Other | 9 | 2015 |
| Nitrate | MR | 6 | 2008 |
| TTHM | MR | 3 | 2007 |
| Methoxychlor | MR | 3 | 2000 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2007 |
| Dalapon | MR | 3 | 2000 |
| Asbestos | MR | 3 | 2009 |
| Diquat | MR | 3 | 2000 |
| Endothall | MR | 3 | 2000 |
| Di(2-ethylhexyl) adipate | MR | 3 | 2000 |
| OXAMYL | MR | 3 | 2000 |
| Simazine | MR | 3 | 2000 |
| Picloram | MR | 3 | 2000 |
| Dinoseb | MR | 3 | 2000 |
| Hexachlorocyclopentadiene | MR | 3 | 2000 |
| Atrazine | MR | 3 | 2000 |
| Endrin | MR | 3 | 2000 |
| Heptachlor | MR | 3 | 2000 |
| Heptachlor epoxide | MR | 3 | 2000 |
| HEXACHLOROBENZENE | MR | 3 | 2000 |
| BHC-GAMMA | MR | 3 | 2000 |
| Benzo(a)pyrene | MR | 3 | 2000 |
| Pentachlorophenol | MR | 3 | 2000 |
| 1,2-DIBROMO-3-CHLOROPROPANE | MR | 3 | 2000 |
| ETHYLENE DIBROMIDE | MR | 3 | 2000 |
| Chlordane | MR | 3 | 2000 |
Violation Count vs. the National Corpus
Cottonwood Municipal Water Cw1 has 367 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 47% of this system's own violations are health-based (173 of 367), and it ranks #4,364 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)
367 Higher than most more violations than 93% 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. 1 of 290 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| HFPO-DA | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFPeS | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 9/16/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/16/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| ADONA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBA | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 6:2 FTS | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 9/16/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/16/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFDoA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| 8:2 FTS | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| NFDHA | 9/16/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFDA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFBS | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOS | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFTA | 9/16/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFOA | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFBS | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFNA | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| ADONA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 9/16/2025 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFHxA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDoA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| NMeFOSAA | 9/16/2025 | <6.00 ppt | 6.00 ppt | Not Detected |
| NEtFOSAA | 9/16/2025 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFTrDA | 9/16/2025 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFTA | 9/16/2025 | <8.00 ppt | 8.00 ppt | Not Detected |
| PFDA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHpS | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFHxS | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeS | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFOA | 9/16/2025 | <4.00 ppt | 4.00 ppt | Not Detected |
| NFDHA | 9/16/2025 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFEESA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMBA | 9/16/2025 | <3.00 ppt | 3.00 ppt | Not Detected |
Health-based violations on Cottonwood Municipal Water Cw1
173 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for AZ0413025.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
367 violations · 11,023 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Cottonwood Municipal Water Cw1
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.