Mason Farm WWTP
Chapel Hill, NC · Orange County · Publicly Owned Treatment Works
- Average flow
- 4.48 MGD
- Design flow
- 14.5 MGD
- NPDES permit
- NC0025241
- Effective
- Permit expires
- July 2030
- Population served
- 84,699
- CWNS 2022
Mason Farm WWTP is a publicly owned wastewater treatment works in Chapel Hill, Orange County, North Carolina treating an average of 4.48 million gallons per day against a permitted design capacity of 14.5 MGD, serving about 84,699 residents. Treatment on site includes clarifiers, biogas silos, biogas balloons. It discharges under NPDES permit NC0025241 (effective), which expires in July 2030, with 0 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Compliance snapshot (last 3 years)
- Total violations
- 0
- Effluent violations
- 0
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Capital improvement projects in Chapel Hill
Chapel Hill's capital improvement plan lists 1 water, sewer and wastewater line items worth $250K starting 2025–2025. The largest budgeted items are shown here.
| Project | Budget | Years |
|---|---|---|
| Cedar Falls Sewer Line | $250,000 | 2025–2025 |
Full project details — scope, funding source, engineering consultant and the decision-makers behind each project — are available in Klarifi, along with similar wastewater capital projects in other cities.
Key contacts
Decision-makers at Mason Farm WWTP.
No verified contacts on file yet
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Nearby wastewater treatment plants in North Carolina
Durham · 7 mi away
4.35 MGD
Hillsborough · 13 mi away
0.89 MGD
Cary · 15 mi away
5.91 MGD
Pittsboro · 15 mi away
0.06 MGD
Apex · 17 mi away
—
Holly Springs · 20 mi away
—
Butner · 20 mi away
1.36 MGD
Graham · 22 mi away
1.9 MGD
Mason Farm WWTP: frequently asked questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026; facility record last updated August 11, 2026.