Peters Township Sanitary Authority
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Donaldson Crossroads Facility

Design Flow: 1.75 MGD

Annual Volume Treated: 231.9 million gallons

Pollutants Removed

BOD:   584,949 lbs.     (99% removal)

TSS:     630,979 lbs.     (99% removal)

Ammonia Nitrogen: 31,864 lbs. (99% removal)

Municipal Wasteload Management Reports

The Pennsylvania Code 25, Chapter 94 requires annual reports to be filed with the PA DEP. The Chapter 94 requires owners of sewage facilities to project, plan, and manage future hydraulic, organic, and industrial waste loadings to their sewage facilities.

2022 Municipal Wasteload Management Report (PDF)





Donaldson Crossroads WPCP

The DC WPCP is located at the confluence of Little Chartiers Creek and Chartiers Creek near the intersection of West McMurray Road and Oakwood Road. The plants hydraulic design capacity is 1.75 million gallons per day (MGD) and its organic design capacity is 1,954 lbs/day Biochemical Oxygen Demand (BOD).  The original plant was constructed in 1964 and has been expanded several times with the most recent upgrade being placed into operation in 2019 adjacent to the old plant site.

Treatment Process

The plant provides advanced secondary treatment with the treatment process consisting of screening followed by the conventional activated sludge process, followed by disinfection and dechlorination, and finally, effluent aeration.  Biological solids (biosolids) produced in the treatment process are stabilized by aerobic digestion, processed on a rotary press for dewatering, and trucked to the landfill.

The treatment process is identical to that of the Brush Run WPCP with the exception that we are not required to remove the TRC before discharging the final effluent to Chartiers Creek. We are required to not exceed a monthly chlorine residual of 1.6 mg/l, which can be achieved without the need for de-chlorination. This plant is monitored through a combination of personnel and an automatic monitoring system.

Treatment Plant Performance



NPDES Permit Limits

2022 Annual Average


1.75 Million Gallons Daily

 0.64 Million Gallons Daily

(Biochemical Oxygen Demand)  

25 mg/l

3 mg/l     
(milligrams per liter)1

Suspended Solids

30 mg/l     

4 mg/l     

Ammonia Nitrogen

Summer – 8.5 mg/l
Winter – 20 mg/l

0.1 mg/l     

(Total Residual Chlorine)

0.5 mg/l     

0.1 mg/l     

1 One milligram per liter is equal to 1 cent in $10,000

Laboratory and Proficiency Testing

Visit PTSA Laboratory for complete details on our process.


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