Community Water System · PWS WV3305412
Williamstown Water Dept
Operator location Williamstown, West Virginia - UCMR5 detected 7 PFAS compounds (upper-third PFAS panel (> 4 compounds)) on this PWS; SDWIS lists 95 violations and 3,469 people served.
- 3,469
- People served (this PWS)
- 95
- EPA violations (this PWS)
- 9
- Health-based (this PWS)
- 7 PFAS
- UCMR5 (this PWS)
Williamstown Water Dept standing, high SDWIS violation third
UCMR5 detected 7 PFAS compounds - upper-third PFAS panel (> 4 compounds). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 9% is middle-third health share (≤ 23%). UCMR5: upper-third PFAS panel (> 4 compounds). Population rank #9,700 of 29,740 among systems serving 500+.
The verdict
Williamstown Water Dept sits in the upper third of the sitemap cohort by violation count (95), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is large (3,469; larger served population (> 3,309)), so household exposure scale sits behind the violation mix. Health-based share is 9% (middle-third health share (≤ 23%)). UCMR5 detected 7 PFAS compounds (upper-third PFAS panel (> 4 compounds)).
- #9,700 of 29,740
- Population · /systems
- #91 of 312
- Population · WV
- 95
- Total EPA violations on record
- 9%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
7 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 1,567
- County
- Wood
- School/Daycare
- No
- MCL Violations
- 4
- Monitoring Violations
- 74
- Treatment Tech Violations
- 5
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| LASSO | MR | 6 | 2014 |
| Groundwater Rule | TT | 5 | 2020 |
| Coliform (TCR) | MCL | 4 | 2002 |
| Di(2-ethylhexyl) adipate | MR | 4 | 2008 |
| Picloram | MR | 4 | 2008 |
| Carbofuran | MR | 4 | 2008 |
| Atrazine | MR | 4 | 2008 |
| Heptachlor | MR | 4 | 2008 |
| Heptachlor epoxide | MR | 4 | 2008 |
| 2,4-D | MR | 4 | 2008 |
| Coliform (TCR) | MR | 4 | 2013 |
| Public Notice | Other | 4 | 2014 |
| Consumer Confidence Rule | Other | 4 | 2024 |
| Lead and Copper Rule | MR | 4 | 2024 |
| Di(2-ethylhexyl) phthalate | MR | 4 | 2008 |
| Hexachlorocyclopentadiene | MR | 4 | 2008 |
| Simazine | MR | 4 | 2008 |
| Total Polychlorinated Biphenyls (PCB) | MR | 4 | 2008 |
| BHC-GAMMA | MR | 4 | 2008 |
| Benzo(a)pyrene | MR | 4 | 2008 |
| OXAMYL | MR | 4 | 2008 |
| Chlordane | MR | 4 | 2008 |
| Groundwater Rule | Other | 2 | 2020 |
Violation Count vs. the National Corpus
Williamstown Water Dept has 95 recorded EPA violations, 72% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 28% carry more. 9% of this system's own violations are health-based (9 of 95), and it ranks #9,700 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)
95 Around the middle fewer violations than 28% 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
PFAS Testing Results (UCMR5)
Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 12 of 58 samples detected PFAS.
| Contaminant | Date | Result | MRL | Status |
|---|---|---|---|---|
| PFOA | 5/16/2023 | 20.20 ppt | 4.00 ppt | Detected |
| 6:2 FTS | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFBA | 5/16/2023 | 6.00 ppt | 5.00 ppt | Detected |
| HFPO-DA | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| ADONA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 9Cl-PF3ONS | 5/16/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFUnA | 5/16/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 5/16/2023 | 9.10 ppt | 3.00 ppt | Detected |
| 4:2 FTS | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFDA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NEtFOSAA | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFOS | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 5/16/2023 | 31.30 ppt | 3.00 ppt | Detected |
| PFHpA | 5/16/2023 | 3.00 ppt | 3.00 ppt | Detected |
| PFBS | 5/16/2023 | 9.40 ppt | 3.00 ppt | Detected |
| NMeFOSAA | 5/16/2023 | <6.00 ppt | 6.00 ppt | Not Detected |
| PFTrDA | 5/16/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
| PFDoA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 8:2 FTS | 5/16/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFMPA | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFPeA | 5/16/2023 | 3.50 ppt | 3.00 ppt | Detected |
| PFMBA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFEESA | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| NFDHA | 5/16/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFPeS | 5/16/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHpS | 5/16/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTA | 5/16/2023 | <8.00 ppt | 8.00 ppt | Not Detected |
| 9Cl-PF3ONS | 11/14/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| ADONA | 11/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| 6:2 FTS | 11/14/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| 4:2 FTS | 11/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFMPA | 11/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| 11Cl-PF3OUdS | 11/14/2023 | <5.00 ppt | 5.00 ppt | Not Detected |
| PFEESA | 11/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOA | 11/14/2023 | 32.00 ppt | 4.00 ppt | Detected |
| PFMBA | 11/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFUnA | 11/14/2023 | <2.00 ppt | 2.00 ppt | Not Detected |
| PFHxA | 11/14/2023 | 5.20 ppt | 3.00 ppt | Detected |
| NFDHA | 11/14/2023 | <20.00 ppt | 20.00 ppt | Not Detected |
| PFDA | 11/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFPeA | 11/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFOS | 11/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFNA | 11/14/2023 | <4.00 ppt | 4.00 ppt | Not Detected |
| PFHxS | 11/14/2023 | 8.70 ppt | 3.00 ppt | Detected |
| PFHpA | 11/14/2023 | 3.90 ppt | 3.00 ppt | Detected |
| PFBS | 11/14/2023 | 7.40 ppt | 3.00 ppt | Detected |
| PFDoA | 11/14/2023 | <3.00 ppt | 3.00 ppt | Not Detected |
| PFTrDA | 11/14/2023 | <7.00 ppt | 7.00 ppt | Not Detected |
UCMR5 PFAS record for Williamstown Water Dept
Open EPA SDWIS federal reports for PWS WV3305412 to cross-check UCMR5 detections and violation codes; state primacy agencies enforce the Safe Drinking Water Act locally.
Sources: EPA SDWIS
Nationwide peers
95 violations · 3,469 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 similar served population
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Williamstown Water Dept
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in West Virginia compares on the same EPA violation measures. West Virginia 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.