Clean Water Act discharge permit · NPDES NC0025241
MASON FARM WWTP, Chapel Hill, NC: NPDES NC0025241 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 15Pollutants under a numeric limit
- 4Pollutants with an effluent exceedance
- 2Inspections on file
- 0Formal enforcement actions
MASON FARM WWTP, held by Orange Water and Sewer Authority, holds NPDES permit NC0025241. EPA’s file records it issued June 19, 2020 and expiring July 31, 2025. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MASON FARM WWTP |
|---|---|
| Permittee as filed | Orange Water and Sewer Authority |
| NPDES ID | NC0025241 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | June 19, 2020 |
| Expiration date | July 31, 2025 |
| Address | Chapel Hill, NC 27514 |
| Subwatershed | Gulf Creek-Cape Fear River (HUC 030300040104) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 16Pollutants on file
- 15Under a numeric limit
- 14With a violation of any kind
- 4With 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 |
|---|---|---|---|---|---|
| Nitrogen, ammonia total [as N] | 4 | 13 | 2 | December 31, 2007 | 37% over the limit |
| BOD, carbonaceous [5 day, 20 C] | 5 | 28 | 1 | August 31, 2018 | 11% over the limit |
| pH | 2 | 3 | 1 | January 31, 2009 | |
| Nitrogen, nitrate total [as N] | 0 | 2 | 1 | March 31, 2016 | 2% over the limit |
| Phosphorus, total [as P] | 2 | 128 | 0 | ||
| Nitrogen, total [as N] | 2 | 119 | 0 | ||
| Solids, total suspended | 2 | 19 | 0 | ||
| Flow, in conduit or thru treatment plant | 1 | 5 | 0 | ||
| Coliform, fecal MF, MFC broth, 44.5 C | 2 | 3 | 0 | ||
| Temperature, water deg. centigrade | 1 | 1 | 0 | ||
| Conductivity | 1 | 1 | 0 | ||
| Oxygen, dissolved [DO] | 1 | 1 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 1 | 1 | 0 | ||
| Chlorine, total residual | 1 | 1 | 0 | ||
| Nitrite + Nitrate total [as N] | 1 | 0 | 0 | ||
| Flow, total | 1 | 0 | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES NC0025241.
Inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| May 7, 2026 | Biomonitoring | S |
| May 1, 2026 | Biomonitoring | S |
Formal enforcement and penalties
0 formal actions, 0 of them with a penalty assessed. Federal and state penalties are separate figures from separate authorities and are shown as each was filed, never added together.
Informal enforcement
EPA’s informal enforcement file holds no action for NPDES NC0025241.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
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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 NC0025241 there.
MASON FARM WWTP, Chapel Hill, North Carolina: Individual permit NC0025241, held by Orange Water and Sewer Authority; Publicly owned treatment works; Administratively continued (past its expiration date and still in force until reissued); issued June 19, 2020, term to July 31, 2025.
2 of the 16 pollutants listed for NPDES NC0025241 have no violation or effluent exceedance.
- Nitrogen, ammonia total [as N]: 4 limits, 13 violations of any kind, 2 effluent exceedances, latest December 31, 2007, largest 37% over the limit.
- BOD, carbonaceous [5 day, 20 C]: 5 limits, 28 violations of any kind, 1 effluent exceedance, latest August 31, 2018, largest 11% over the limit.
- pH: 2 limits, 3 violations of any kind, 1 effluent exceedance, latest January 31, 2009.
- Nitrogen, nitrate total [as N]: 0 limits, 2 violations of any kind, 1 effluent exceedance, latest March 31, 2016, largest 2% over the limit.
- Phosphorus, total [as P]: 2 limits, 128 violations of any kind.
- Nitrogen, total [as N]: 2 limits, 119 violations of any kind.
- Solids, total suspended: 2 limits, 19 violations of any kind.
- Flow, in conduit or thru treatment plant: 1 limit, 5 violations of any kind.
- Coliform, fecal MF, MFC broth, 44.5 C: 2 limits, 3 violations of any kind.
- Temperature, water deg. centigrade: 1 limit, 1 violation of any kind.
- Conductivity: 1 limit, 1 violation of any kind.
- Oxygen, dissolved [DO]: 1 limit, 1 violation of any kind.
- Nitrogen, Kjeldahl, total [as N]: 1 limit, 1 violation of any kind.
- Chlorine, total residual: 1 limit, 1 violation of any kind.
- Nitrite + Nitrate total [as N]: 1 limit.
- Flow, total: 1 limit.
- May 7, 2026: Biomonitoring (S).
- May 1, 2026: Biomonitoring (S).
North Carolina holds 95 Publicly owned treatment works coverages of this permit type in EPA’s file; 56 were issued before NC0025241. Orange Water and Sewer Authority holds 6 permits in North Carolina.
Other permits held by Orange Water and Sewer Authority
- MORGAN CREEK INTERCEPTOR REPLACEMENT PHASE 1, Chapel Hill: NCC233720, issued 2024-04-01
- W ROSEMARY STREET WATER LINE REPLACEMENT, Chapel Hill: NCC251491, issued 2025-05-23
- BURNING TREE DRIVE WATER LINE REPLACEMENT, Chapel Hill: NCC261277, issued 2026-05-19
- RIDGEFIELD - BRIARCLIFF NEIGHBORHOOD, Chapel Hill: NCC261754, issued 2026-06-29
- MASON FARM WWTP, Chapel Hill: NCG110048, issued 2023-06-01
Coverages issued nearest NC0025241
- 2020-05-11: BAKERSVILLE WWTP, Bakersville: NC0025461, held by Town of Bakersville
- 2020-05-14: JACOB CORNSILK COMPLEX, Robbinsville: NC0089907, held by Eastern Band of Cherokee Indians (Jacob Cornsilk Complex)
- 2020-06-10: SPINDALE WWTP, Spindale: NC0020664, held by Town of Spindale
- 2020-06-17: YADKIN VALLEY SEWER AUTHORITY WWTP, Elkin: NC0020567, held by Yadkin Valley Sewer Authority
- 2020-06-17: TRYON WWTP, Tryon: NC0021601, held by Town of Tryon
- 2020-06-24: YADKIN RIVER WATER TREATMENT PLANT, Unionville: NC0089893, held by Union County Public Works
- 2020-06-29: BUNN WWTP, Bunn: NC0042269, held by Town of Bunn
- 2020-07-16: TARBORO WWTP, Tarboro: NC0020605, held by Town of Tarboro
- 2020-08-20: NORTH WWTP, Claremont: NC0032662, held by City of Claremont
- 2020-09-15: OLD FORT WWTP, Old Fort: NC0021229, held by Town of Old Fort
MASON FARM WWTP among its neighbors
74 discharge permits are in the Gulf Creek-Cape Fear River subwatershed (HUC 030300040104); NC0025241 is one.
Other permits in the Gulf Creek-Cape Fear River subwatershed (HUC 030300040104)
- 1007 WAVE ROAD, Chapel Hill: NCG551687, minor, term to 2025-10-31
- 107 TURNAGE ROAD, Chapel Hill: NCG551321, minor, term to 2013-07-31
- 108 HUNTER HILL PLACE, Chapel Hill: NCG551596, minor, term to 2025-10-31
- 1105 OLD LYSTRA ROAD, Chapel Hill: NCG550721, minor, term to 2025-10-31
- 1112 KALWORTH ROAD, Wake Forest: NCG551701, minor, term to 2025-10-31
- 12085 US 15-501 NORTH, Chapel Hill: NCG551318, minor, term to 2025-10-31
- 124 CHEROKEE DRIVE, Chapel Hill: NCG551246, minor, term to 2025-10-31
- 1322 TALLYHO TRAIL, Chapel Hill: NCG551594, minor, term to 2025-10-31
- 1403 GRAY BLUFF TRAIL, Chapel Hill: NCG551127, minor, term to 2025-10-31
- 1443 POINSETT DRIVE, Chapel Hill: NCG551319, minor, term to 2025-10-31
Nearby on the register
- Discharge permits in Chapel Hill
- Every permit record in Chapel Hill, A to Z
- Discharge permits in North Carolina
- Every permit record in North Carolina, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.
What this page shows
This public-records page covers the Clean Water Act discharge permit NPDES NC0025241 for MASON FARM WWTP in Chapel Hill, NC, held by Orange Water and Sewer Authority and listed as administratively continued with a Major Discharger class. The page reports 16 pollutants on file, 15 under a numeric limit, 14 with a violation of any kind, and 4 with an effluent exceedance, within subwatershed HUC 030300040104.