Non-Transient Non-Community Water System · PWS AZ0408704
Willow Beach Nps
Operator location Boulder City, Arizona - 0% of 376 violations are health-based (lower-third health share (≤ 1%)); groundwater source; 789 served per SDWIS.
- 789
- People served (this PWS)
- 376
- EPA violations (this PWS)
- 1
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Willow Beach Nps standing, high SDWIS violation third
0% of 376 recorded violations are health-based - lower-third health share (≤ 1%). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 0% is lower-third health share (≤ 1%). Population rank #22,842 of 29,740 among systems serving 500+.
The verdict
Willow Beach Nps sits in the upper third of the sitemap cohort by violation count (376), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (789; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is only 0% - almost all of this trail is monitoring or reporting. No UCMR5 PFAS test appears for this system in this extract.
- #22,842 of 29,740
- Population · /systems
- #317 of 413
- Population · AZ
- 376
- Total EPA violations on record
- 0%
- 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
- Non-Transient Non-Community
- Owner Type
- Federal
- Connections
- 15
- County
- Mohave
- School/Daycare
- No
- MCL Violations
- 1
- Monitoring Violations
- 339
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Chlorine | MR | 38 | 2024 |
| Nitrate | MR | 25 | 2025 |
| Arsenic | MR | 24 | 2025 |
| cis-1,2-Dichloroethylene | MR | 10 | 2023 |
| Xylenes, Total | MR | 10 | 2023 |
| DICHLOROMETHANE | MR | 10 | 2023 |
| o-Dichlorobenzene | MR | 10 | 2023 |
| p-Dichlorobenzene | MR | 10 | 2023 |
| 1,1-Dichloroethylene | MR | 10 | 2023 |
| trans-1,2-Dichloroethylene | MR | 10 | 2023 |
| 1,1,1-Trichloroethane | MR | 10 | 2023 |
| Carbon tetrachloride | MR | 10 | 2023 |
| 1,2-Dichloropropane | MR | 10 | 2023 |
| Trichloroethylene | MR | 10 | 2023 |
| 1,1,2-Trichloroethane | MR | 10 | 2023 |
| Benzene | MR | 10 | 2023 |
| Ethylbenzene | MR | 10 | 2023 |
| Styrene | MR | 10 | 2023 |
| 1,2-Dichloroethane | MR | 10 | 2023 |
| Tetrachloroethylene | MR | 10 | 2023 |
| CHLOROBENZENE | MR | 10 | 2023 |
| 1,2,4-Trichlorobenzene | MR | 10 | 2023 |
| Toluene | MR | 10 | 2023 |
| Vinyl chloride | MR | 9 | 2023 |
| Consumer Confidence Rule | Other | 6 | 2017 |
| Revised Total Coliform Rule | RPT | 4 | 2022 |
| Gross Alpha, Excl. Radon and U | MR | 4 | 2013 |
| Coliform (TCR) | MR | 3 | 2004 |
| Total Haloacetic Acids (HAA5) | MR | 3 | 2025 |
| Asbestos | MR | 3 | 2010 |
Violation Count vs. the National Corpus
Willow Beach Nps has 376 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 0% of this system's own violations are health-based (1 of 376), and it ranks #22,842 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)
376 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
Health-based violations on Willow Beach Nps
1 health-based rows in the tables above map to MCL or treatment-technique exceedances, verify each contaminant code on the federal SDWIS report for AZ0408704.
Sources: EPA SDWIS · Arizona DEQ, Drinking Water Program
Nationwide peers
376 violations · 789 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 Willow Beach Nps
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.