Community Water System · PWS PA5100049
Mars Borough Water Works
Operator location Mars, Pennsylvania - upper-third violation load (> 74 violations) with 519 EPA violations; groundwater source; 1,956 served (PWS-level, not municipal population).
- 1,956
- People served (this PWS)
- 519
- EPA violations (this PWS)
- 3
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Mars Borough Water Works standing, high SDWIS violation third
519 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 #13,833 of 29,740 among systems serving 500+.
The verdict
Mars Borough Water Works sits in the upper third of the sitemap cohort by violation count (519), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,956 (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.
- #13,833 of 29,740
- Population · /systems
- #537 of 1,340
- Population · PA
- 519
- 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.
System Details
- System Type
- Community
- Owner Type
- Local
- Connections
- 665
- County
- Butler
- School/Daycare
- No
- MCL Violations
- 0
- Monitoring Violations
- 490
- Treatment Tech Violations
- 3
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| 1,2-Dichloropropane | MR | 19 | 2020 |
| CHLOROBENZENE | MR | 19 | 2020 |
| Styrene | MR | 19 | 2020 |
| Trichloroethylene | MR | 19 | 2020 |
| Tetrachloroethylene | MR | 19 | 2020 |
| 1,1,2-Trichloroethane | MR | 19 | 2020 |
| Toluene | MR | 19 | 2020 |
| Ethylbenzene | MR | 19 | 2020 |
| Benzene | MR | 19 | 2020 |
| 1,2,4-Trichlorobenzene | MR | 18 | 2020 |
| cis-1,2-Dichloroethylene | MR | 18 | 2020 |
| p-Dichlorobenzene | MR | 18 | 2020 |
| trans-1,2-Dichloroethylene | MR | 18 | 2020 |
| 1,2-Dichloroethane | MR | 18 | 2020 |
| Carbon tetrachloride | MR | 18 | 2020 |
| DICHLOROMETHANE | MR | 18 | 2020 |
| o-Dichlorobenzene | MR | 18 | 2020 |
| 1,1-Dichloroethylene | MR | 18 | 2020 |
| 1,1,1-Trichloroethane | MR | 18 | 2020 |
| Xylenes, Total | MR | 18 | 2020 |
| Consumer Confidence Rule | Other | 13 | 2008 |
| Groundwater Rule | MR | 8 | 2024 |
| Public Notice | Other | 7 | 2025 |
| Chlorine | MR | 6 | 2014 |
| Total Haloacetic Acids (HAA5) | MR | 6 | 2014 |
| TTHM | MR | 6 | 2014 |
| Gross Alpha, Excl. Radon and U | MR | 6 | 2006 |
| Radium-226 | MR | 4 | 2006 |
| Combined Uranium | MR | 4 | 2006 |
| Radium-228 | MR | 4 | 2006 |
Violation Count vs. the National Corpus
Mars Borough Water Works has 519 recorded EPA violations, 96% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 4% carry more. 1% of this system's own violations are health-based (3 of 519), and it ranks #13,833 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)
519 Higher than most more violations than 96% 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
SDWIS compliance record for Mars Borough Water Works
519 violations on record for PA5100049; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Pennsylvania DEP, Bureau of Safe Drinking Water
Nationwide peers
519 violations · 1,956 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 Mars Borough Water Works
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Pennsylvania compares on the same EPA violation measures. Pennsylvania 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.