Community Water System · PWS WV3302708
Mason Water Dept
Operator location Mason, West Virginia - upper-third violation load (> 74 violations) with 493 EPA violations; groundwater source; 1,679 served (PWS-level, not municipal population).
- 1,679
- People served (this PWS) Middle third of systems
- 493
- EPA violations (this PWS) Upper third of systems
- 4
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Mason Water Dept standing, high SDWIS violation third
493 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 1% is middle-third health share (≤ 23%). Population rank #15,009 of 29,740 among systems serving 500+.
The verdict
Mason Water Dept sits in the upper third of the sitemap cohort by violation count (493), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,679 (mid served population (≤ 3,309)). Health-based share is 1% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #15,009 of 29,740
- Population · /systems
- #190 of 312
- Population · WV
- 493
- Total EPA violations on record
- 1%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
Based on EPA SDWIS violation history and UCMR5 PFAS testing only, not water taste, odor, infrastructure age, or contaminants outside the federally tracked set.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 769
- County
- Mason
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 426
- Treatment Tech Violations
- 4
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Nitrate | MR | 42 | 2025 |
| Public Notice | Other | 34 | 2025 |
| Consumer Confidence Rule | Other | 17 | 2025 |
| Lead and Copper Rule | MR | 15 | 2023 |
| TTHM | MR | 14 | 2020 |
| Total Haloacetic Acids (HAA5) | MR | 14 | 2020 |
| Chlorine | MR | 13 | 2025 |
| Di(2-ethylhexyl) adipate | MR | 11 | 2013 |
| OXAMYL | MR | 11 | 2013 |
| Picloram | MR | 11 | 2013 |
| Atrazine | MR | 11 | 2013 |
| Total Polychlorinated Biphenyls (PCB) | MR | 11 | 2013 |
| Simazine | MR | 11 | 2013 |
| Di(2-ethylhexyl) phthalate | MR | 11 | 2013 |
| Hexachlorocyclopentadiene | MR | 11 | 2013 |
| Carbofuran | MR | 11 | 2013 |
| LASSO | MR | 11 | 2013 |
| Heptachlor | MR | 11 | 2013 |
| 2,4-D | MR | 11 | 2013 |
| Heptachlor epoxide | MR | 11 | 2013 |
| Benzo(a)pyrene | MR | 11 | 2013 |
| BHC-GAMMA | MR | 11 | 2013 |
| Chlordane | MR | 11 | 2013 |
| Methoxychlor | MR | 8 | 2013 |
| Endrin | MR | 4 | 2002 |
| Toxaphene | MR | 4 | 2002 |
| Dinoseb | MR | 4 | 2002 |
| 2,4,5-TP | MR | 4 | 2002 |
| HEXACHLOROBENZENE | MR | 4 | 2002 |
| ETHYLENE DIBROMIDE | MR | 4 | 2002 |
Violation Count vs. the National Corpus
Mason Water Dept has 493 recorded EPA violations, 95% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 5% carry more. 1% of this system's own violations are health-based (4 of 493), and it ranks #15,009 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)
493 Higher than most more violations than 95% 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
How many violations vs. how serious, among peer systems
Mason Water Dept plotted against 29 peer public water systems (500+ people served), by total violation count (x) and the share of those violations that are health-based (y). The crosshair sits at this sample's own median on each axis. A high violation count does not automatically mean a serious record: most monitoring and reporting violations are minor, not health-based.
Violation volume vs. health-based share
SDWIS compliance record for Mason Water Dept
493 violations on record for WV3302708; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS
Nationwide peers
493 violations · 1,679 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 near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Mason 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.
Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.