Community Water System · PWS AZ0415027
Epcor - Parker Dam
Operator location El Mirage, Arizona - smaller served population (≤ 999) at 429 people served; 420 SDWIS violations on record from surface water sources.
- 429
- People served (this PWS)
- 420
- EPA violations (this PWS)
- 35
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Epcor - Parker Dam standing, high SDWIS violation third
429 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 8% is middle-third health share (≤ 23%).
The verdict
Epcor - Parker Dam sits in the upper third of the sitemap cohort by violation count (420), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (429; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 8% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 420
- Total EPA violations on record
- 8%
- Health-based (MCL / treatment failure)
- 429
- People served by this PWS (SDWIS)
- N/A
- 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
- 195
- County
- La Paz
- School/Daycare
- No
- MCL Violations
- 13
- Monitoring Violations
- 289
- Treatment Tech Violations
- 22
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Interim Enhanced Surface Water Treatment Rule | MR | 45 | 2020 |
| Coliform (TCR) | MR | 28 | 2012 |
| Chlorine | MR | 25 | 2020 |
| Lead and Copper Rule | MR | 18 | 2023 |
| Consumer Confidence Rule | Other | 17 | 2015 |
| Surface Water Treatment Rule | MR | 16 | 2020 |
| TTHM | MCL | 13 | 2018 |
| Surface Water Treatment Rule | TT | 11 | 2020 |
| TTHM | MR | 11 | 2020 |
| Total Haloacetic Acids (HAA5) | MR | 11 | 2020 |
| Interim Enhanced Surface Water Treatment Rule | TT | 11 | 2020 |
| Nitrate | MR | 10 | 2004 |
| Xylenes, Total | MR | 9 | 2001 |
| Public Notice | Other | 8 | 2021 |
| Chromium | MR | 6 | 1998 |
| Barium | MR | 6 | 1998 |
| Arsenic | MR | 6 | 1998 |
| Cadmium | MR | 6 | 1998 |
| E. COLI | MR | 6 | 2018 |
| Mercury | MR | 6 | 1998 |
| Selenium | MR | 6 | 1998 |
| Fluoride | MR | 5 | 1994 |
| Revised Total Coliform Rule | MON | 4 | 2018 |
| Endrin | MR | 3 | 2001 |
| Endothall | MR | 3 | 2001 |
| BHC-GAMMA | MR | 2 | 1998 |
| Methoxychlor | MR | 2 | 1998 |
| Simazine | MR | 2 | 2001 |
| DICHLOROMETHANE | MR | 2 | 2000 |
| 2,4-D | MR | 2 | 1998 |
Violation Count vs. the National Corpus
Epcor - Parker Dam has 420 recorded EPA violations, 94% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 6% carry more. 8% of this system's own violations are health-based (35 of 420), 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)
420 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
Population served record for Epcor - Parker Dam
EPA SDWIS lists 429 people served and 195 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
420 violations · 429 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 Epcor - Parker Dam
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.