Community Water System · PWS AZ0415096
Cs Q Mountain Water Company
Operator location Des Peres, Arizona - upper-third violation load (> 74 violations) with 154 EPA violations; groundwater source; 1,224 served (PWS-level, not municipal population).
- 1,224
- People served (this PWS)
- 154
- EPA violations (this PWS)
- 6
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Cs Q Mountain Water Company standing, high SDWIS violation third
154 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 4% is middle-third health share (≤ 23%). Population rank #17,642 of 29,740 among systems serving 500+.
The verdict
Cs Q Mountain Water Company sits in the upper third of the sitemap cohort by violation count (154), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,224 (mid served population (≤ 3,309)). Health-based share is 4% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #17,642 of 29,740
- Population · /systems
- #247 of 413
- Population · AZ
- 154
- Total EPA violations on record
- 4%
- 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
- Private
- Connections
- 478
- County
- La Paz
- School/Daycare
- No
- MCL Violations
- 6
- Monitoring Violations
- 109
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 38 | 2016 |
| Revised Total Coliform Rule | RPT | 25 | 2022 |
| Lead and Copper Rule | MR | 14 | 2025 |
| Consumer Confidence Rule | Other | 11 | 2020 |
| Coliform (TCR) | MCL | 6 | 2013 |
| Nitrate | MR | 4 | 2004 |
| E. COLI | MR | 3 | 2020 |
| DICHLOROMETHANE | MR | 1 | 2002 |
| 1,1-Dichloroethylene | MR | 1 | 2002 |
| 1,2-Dichloroethane | MR | 1 | 2002 |
| 1,1,1-Trichloroethane | MR | 1 | 2002 |
| Carbon tetrachloride | MR | 1 | 2002 |
| 1,1,2-Trichloroethane | MR | 1 | 2002 |
| Tetrachloroethylene | MR | 1 | 2002 |
| CHLOROBENZENE | MR | 1 | 2002 |
| Ethylbenzene | MR | 1 | 2002 |
| Endrin | MR | 1 | 1998 |
| BHC-GAMMA | MR | 1 | 1998 |
| Methoxychlor | MR | 1 | 1998 |
| Dalapon | MR | 1 | 1998 |
| Diquat | MR | 1 | 1998 |
| Endothall | MR | 1 | 1998 |
| Simazine | MR | 1 | 1998 |
| Di(2-ethylhexyl) phthalate | MR | 1 | 1998 |
| Picloram | MR | 1 | 1998 |
| Dinoseb | MR | 1 | 1998 |
| Carbofuran | MR | 1 | 1998 |
| 2,4-D | MR | 1 | 1998 |
| Atrazine | MR | 1 | 1998 |
| LASSO | MR | 1 | 1998 |
Violation Count vs. the National Corpus
Cs Q Mountain Water Company has 154 recorded EPA violations, 81% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 18% carry more. 4% of this system's own violations are health-based (6 of 154), and it ranks #17,642 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)
154 Higher than most more violations than 81% 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
SDWIS compliance record for Cs Q Mountain Water Company
154 violations on record for AZ0415096; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
154 violations · 1,224 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 Cs Q Mountain Water Company
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.