Community Water System · PWS 084690481
Allen Water System
Operator location Pine Ridge, EPA Region 8 — Tribal Water Systems - smaller served population (≤ 999) at 420 people served; 49 SDWIS violations on record from surface water sources.
- 420
- People served (this PWS)
- 49
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Allen Water System standing, mid SDWIS violation third
420 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 6% is middle-third health share (≤ 23%).
The verdict
Allen Water System lands in the middle third by violation volume (49), large enough for peer comparisons without matching the fleet's heaviest ledgers. Population served is smaller (420; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 6% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 49
- Total EPA violations on record
- 6%
- Health-based (MCL / treatment failure)
- 420
- 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
- Native American
- Connections
- 86
- School/Daycare
- No
- MCL Violations
- 3
- Monitoring Violations
- 40
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Lead and Copper Rule | MR | 9 | 2023 |
| Coliform (TCR) | MR | 8 | 2015 |
| Consumer Confidence Rule | Other | 6 | 2010 |
| TTHM | MR | 5 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 5 | 2025 |
| Coliform (TCR) | MCL | 3 | 1997 |
| Gross Alpha, Excl. Radon and U | MR | 2 | 1982 |
| Nitrate | MR | 2 | 1994 |
| Revised Total Coliform Rule | MON | 1 | 2019 |
| Mercury | MR | 1 | 1983 |
| Fluoride | MR | 1 | 1983 |
| Selenium | MR | 1 | 1983 |
| Cadmium | MR | 1 | 1983 |
| Chromium | MR | 1 | 1983 |
| Combined Radium (-226 and -228) | MR | 1 | 1976 |
| Barium | MR | 1 | 1983 |
| Arsenic | MR | 1 | 1983 |
Violation Count vs. the National Corpus
Allen Water System has 49 recorded EPA violations, 56% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 44% carry more. 6% of this system's own violations are health-based (3 of 49), 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)
49 Around the middle fewer violations than 44% 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 Allen Water System
EPA SDWIS lists 420 people served and 86 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
49 violations · 420 served: nearest cross-state SDWIS matches.
Cross-state systems near this violation count
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
What to do with Allen Water System
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in EPA Region 8 — Tribal Water Systems compares on the same EPA violation measures. EPA Region 8 — Tribal Water Systems 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.