Community Water System · PWS AR0000123
Black Oak Waterworks
Operator location Lake City, Arkansas - smaller served population (≤ 999) at 264 people served; 110 SDWIS violations on record from groundwater sources.
- 264
- People served (this PWS)
- 110
- EPA violations (this PWS)
- 14
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Black Oak Waterworks standing, high SDWIS violation third
264 people served (SDWIS) - smaller served population (≤ 999). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 13% is middle-third health share (≤ 23%).
The verdict
Black Oak Waterworks sits in the upper third of the sitemap cohort by violation count (110), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is smaller (264; smaller served population (≤ 999)), so each violation row represents a compact service footprint. Health-based share is 13% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- 110
- Total EPA violations on record
- 13%
- Health-based (MCL / treatment failure)
- 264
- 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
- Local
- Connections
- 132
- County
- Craighead
- School/Daycare
- No
- MCL Violations
- 14
- Monitoring Violations
- 42
- Treatment Tech Violations
- 0
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Coliform (TCR) | MR | 32 | 2008 |
| Coliform (TCR) | Other | 21 | 2000 |
| Coliform (TCR) | MCL | 14 | 2004 |
| Consumer Confidence Rule | Other | 12 | 2019 |
| Lead and Copper Rule | MR | 5 | 2021 |
| Revised Total Coliform Rule | MON | 2 | 2016 |
| E. COLI | MR | 2 | 2012 |
| Surface Water Treatment Rule | Other | 1 | 1994 |
| Public Notice | Other | 1 | 2017 |
| Revised Total Coliform Rule | RPT | 1 | 2025 |
| Surface Water Treatment Rule | MR | 1 | 1994 |
Violation Count vs. the National Corpus
Black Oak Waterworks has 110 recorded EPA violations, 75% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 25% carry more. 13% of this system's own violations are health-based (14 of 110), 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)
110 Around the middle fewer violations than 25% 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 Black Oak Waterworks
EPA SDWIS lists 264 people served and 132 connections for this PWS, confirm the service-area footprint on the federal report before comparing to municipal census totals.
Sources: EPA SDWIS
Nationwide peers
110 violations · 264 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 Black Oak Waterworks
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Arkansas compares on the same EPA violation measures. Arkansas 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.