Community Water System · PWS PA7280021
Mercersburg Muni Water Auth
Operator location Mercersburg, Pennsylvania - upper-third violation load (> 74 violations) with 365 EPA violations; surface water source; 2,350 served (PWS-level, not municipal population).
- 2,350
- People served (this PWS) Middle third of systems
- 365
- EPA violations (this PWS) Upper third of systems
- 57
- Health-based (this PWS) Middle third by health-based share
- Untested
- UCMR5 (this PWS) No UCMR5 result
Mercersburg Muni Water Auth standing, high SDWIS violation third
365 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 16% is middle-third health share (≤ 23%). Population rank #12,423 of 29,740 among systems serving 500+.
The verdict
Mercersburg Muni Water Auth sits in the upper third of the sitemap cohort by violation count (365), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 2,350 (mid served population (≤ 3,309)). Health-based share is 16% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #12,423 of 29,740
- Population · /systems
- #478 of 1,340
- Population · PA
- 365
- Total EPA violations on record
- 16%
- 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
- 993
- County
- Franklin
- School/Daycare
- No
- MCL Violations
- 26
- Monitoring Violations
- 265
- Treatment Tech Violations
- 31
Violation History
Contaminant violations recorded by EPA.
| Contaminant | Category | Count | Latest |
|---|---|---|---|
| Surface Water Treatment Rule | MR | 41 | 2024 |
| CARBON, TOTAL | MR | 30 | 2025 |
| Interim Enhanced Surface Water Treatment Rule | MR | 24 | 2024 |
| Public Notice | Other | 23 | 2024 |
| Surface Water Treatment Rule | TT | 22 | 2021 |
| Nitrate | MCL | 21 | 1989 |
| Chlorine | MR | 18 | 2024 |
| Groundwater Rule | MR | 18 | 2024 |
| TTHM | MR | 12 | 2023 |
| Revised Total Coliform Rule | MON | 10 | 2025 |
| Total Haloacetic Acids (HAA5) | MR | 9 | 2023 |
| Fluoride | MR | 8 | 2011 |
| Nitrate | MR | 8 | 1995 |
| Arsenic | MR | 6 | 1995 |
| Cadmium | MR | 6 | 1995 |
| Chromium | MR | 6 | 1995 |
| Mercury | MR | 6 | 1995 |
| Selenium | MR | 6 | 1995 |
| Barium | MR | 6 | 1995 |
| Revised Total Coliform Rule | MCL | 5 | 2023 |
| Consumer Confidence Rule | Other | 4 | 2006 |
| CARBON, TOTAL | TT | 4 | 2011 |
| Glyphosate | MR | 4 | 1995 |
| CYANIDE | MR | 3 | 1995 |
| Nickel | MR | 3 | 1995 |
| Antimony, Total | MR | 3 | 1995 |
| Beryllium, Total | MR | 3 | 1995 |
| Thallium, Total | MR | 3 | 1995 |
| Groundwater Rule | TT | 3 | 2020 |
| Radium-228 | MR | 3 | 2006 |
Violation Count vs. the National Corpus
Mercersburg Muni Water Auth has 365 recorded EPA violations, 93% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 7% carry more. 16% of this system's own violations are health-based (57 of 365), and it ranks #12,423 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)
365 Higher than most more violations than 93% 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
Mercersburg Muni Water Auth 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 Mercersburg Muni Water Auth
365 violations on record for PA7280021; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Pennsylvania DEP, Bureau of Safe Drinking Water
Nationwide peers
365 violations · 2,350 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 Mercersburg Muni Water Auth
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.
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.