Clean Water Act discharge permit · NPDES PA0022179
MERCERSBURG STP, Mercersburg, PA: NPDES PA0022179 discharge permit, effluent exceedances, inspections, penalties
- EffectivePermit status
- MinorDischarger class
- 13Pollutants under a numeric limit
- 6Pollutants with an effluent exceedance
MERCERSBURG STP, held by MERCERSBURG SEW AUTH FRANKLIN CNTY, holds NPDES permit PA0022179, which discharges to Johnston Run. EPA’s file records it issued October 26, 2018 and expiring October 31, 2023. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MERCERSBURG STP |
|---|---|
| Permittee as filed | MERCERSBURG SEW AUTH FRANKLIN CNTY |
| NPDES ID | PA0022179 |
| Permit status | Effective |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | October 26, 2018 |
| Expiration date | October 31, 2023 |
| Issuing agency | State Environmental Organization |
| Address | Mercersburg, PA 17236 |
| Receiving water | Johnston Run |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Lower West Branch Conococheague Creek (HUC 020700040605) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 18Pollutants on file
- 13Under a numeric limit
- 18With a violation of any kind
- 6With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Oxygen, dissolved [DO] | 1 | 45 | 26 | April 30, 2024 | 99% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 8 | 97 | 21 | April 30, 2026 | 119% over the limit |
| Solids, total suspended | 7 | 150 | 17 | February 28, 2026 | 247% over the limit |
| Coliform, fecal general | 4 | 42 | 17 | May 31, 2026 | 684% over the limit |
| Nitrogen, ammonia total [as N] | 4 | 54 | 13 | May 31, 2023 | 421% over the limit |
| pH | 2 | 40 | 2 | April 30, 2024 | |
| BOD, 5-day, 20 deg. C | 3 | 59 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 41 | 0 | ||
| Nitrogen, total [as N] | 4 | 38 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 4 | 37 | 0 | ||
| Nitrite + Nitrate total [as N] | 4 | 37 | 0 | ||
| Phosphorus, total [as P] | 4 | 37 | 0 | ||
| Nitrogen, Total | 0 | 28 | 0 | ||
| Phosphorus, Total | 0 | 26 | 0 | ||
| Nitrogen, Ammonia Total | 0 | 13 | 0 | ||
| Nitrogen, Kjeldahl Total | 0 | 13 | 0 | ||
| Nitrite Plus Nitrate Total | 0 | 13 | 0 | ||
| Ultraviolet light intensity | 1 | 4 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 12Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 21, 2023 | Permit Violations - CWA §308 Failure to submit required permit application information | ST6 |
| June 14, 2023 | Permit Violations - Failure to Submit Timely Permit Renewal Application | ST6 |
| March 29, 2023 | Reporting Violations - Failure to Submit DMRs | ST6 |
| March 29, 2023 | Management Practice Violations - Failure to Maintain Records | ST6 |
| March 29, 2023 | Permit Violations - Violation Specified in Comment | ST6 |
| January 4, 2023 | Permit Violations - Failure to Pay Fees | ST6 |
| April 5, 2022 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| April 2, 2021 | Effluent Violations - Numeric effluent violation | ST6 |
| November 25, 2020 | Reporting Violations - Failure to Notify | ST6 |
| November 25, 2020 | Effluent Violations - Numeric effluent violation | ST6 |
| July 22, 2019 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| September 21, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID PA0022179 there.
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Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.