Treated Water Pond Reservoir Report

Last Updated: December 5, 2025

Treated Water Pond, located in Fallowfield Township, Pennsylvania, is a privately owned water resource regulated by the Pennsylvania Department of Environmental Protection.


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Summary

This earth dam structure, completed in 1966, serves a primary purpose of "Other" and has a storage capacity of 877 acre-feet. With a dam height of 58.8 feet and a length of 3400 feet, the pond covers a surface area of 25 acres and drains an area of 0.06 square miles.

The dam's hazard potential is rated as "High", but its condition assessment is deemed "Satisfactory". It is regularly inspected by the Mine Safety and Health Administration, with the last inspection taking place in April 2020. Despite being non-federally owned, Treated Water Pond falls under state jurisdiction and is subject to permitting, inspection, and enforcement by the Pennsylvania Department of Environmental Protection. Its location near Sawmill Creek in Washington County, Pennsylvania highlights its importance in managing water resources in the region.

For water resource and climate enthusiasts, Treated Water Pond represents a significant infrastructure that plays a crucial role in water management and regulation. Its storage capacity, structural characteristics, and regulatory oversight make it a key component in ensuring water quality and safety in the area. As climate change continues to impact water resources, understanding and monitoring structures like Treated Water Pond are essential for sustainable water management practices in the region.

Year Completed

1966

Dam Length

3400

Dam Height

58.8

River Or Stream

SAWMILL CREEK

Primary Dam Type

Earth

Surface Area

25

Drainage Area

0.06

Nid Storage

877

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

59
       
Seasonal Comparison

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Dam Data Reference

Condition Assessment

Satisfactory
No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.

Hazard Potential Classification

High
Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.