Mount Airy WWTP
Mount Airy, MD · Frederick County · Publicly Owned Treatment Works
- Average flow
- 0.69 MGD
- Design flow
- 1.2 MGD
- NPDES permit
- MD0022527
- Expired
- Permit expires
- December 2025
- Population served
- 9,701
- CWNS 2022
Mount Airy WWTP is a publicly owned wastewater treatment works in Mount Airy, Frederick County, Maryland treating an average of 0.69 million gallons per day against a permitted design capacity of 1.2 MGD, serving about 9,701 residents. Treatment on site includes clarifiers. It discharges under NPDES permit MD0022527 (expired), which expires in December 2025, with 142 recorded violations in the last three years.
Treatment technology
Treatment structures identified at this facility. Exact unit counts are available in Klarifi.
Clarifiers
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Compliance snapshot (last 3 years)
- Total violations
- 142
- Effluent violations
- 1
Based on NPDES Discharge Monitoring Reports. Full violation history, parameters and discharge data available in the Klarifi platform.
Key contacts
Decision-makers at Mount Airy WWTP.
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Nearby wastewater treatment plants in Maryland
Mount Airy · 1 mi away
0.03 MGD
Mount Airy · 4 mi away
0.06 MGD
Gaithersburg · 9 mi away
0.72 MGD
Ijamsville · 9 mi away
0.06 MGD
Sykesville · 10 mi away
1.97 MGD
New Windsor · 12 mi away
0.09 MGD
Westminster · 14 mi away
3.41 MGD
Frederick · 14 mi away
5.4 MGD
Mount Airy 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 March 9, 2025.