Pennsylvania American Water issued a mandatory water conservation order Sunday, September 6, for approximately 23,000 customer connections in its Coatesville water system, spanning parts of Chester and Lancaster counties, after recent weather-related changes strained the plant's treatment capacity.
Why the Order Was Issued
According to Pennsylvania American Water, recent weather-related changes to local water sources — including high heat and heavy rainfall — increased the amount of treatment required at its plant, placing additional demand on its filtration systems and temporarily reducing overall treatment capacity. The Coatesville system draws its raw water from surface sources including the Rock Run Reservoir, the West Branch Brandywine Creek, and the upper West Branch Octoraro Creek — sources that are particularly susceptible to increased turbidity (cloudiness) and contamination following storm runoff, which can overwhelm a treatment plant's filtration capacity relative to normal operating conditions.
Which Communities Are Affected
In Chester County, the order covers the City of Coatesville, along with the boroughs of Atglen, Parkesburg, and South Coatesville, and the townships of Caln, East Fallowfield, Highland, Valley, West Brandywine, and West Sadsbury. In Lancaster County, the order extends to the boroughs of Christiana and Quarryville, and the townships of Bart, Colerain, Eden, and Sadsbury.
What Customers Are Being Asked to Do
Affected customers are being asked to limit water use to essential purposes only, with a targeted reduction in overall consumption of 10% to 15%. That includes cutting back on nonessential activities such as outdoor watering. Notably, officials have stressed there are no health-related concerns with the water itself — customers may simply experience low water pressure or occasional discoloration while the plant works to restore normal capacity.
How Local Officials Are Spreading the Word
Pennsylvania American Water is notifying affected customers through its automated emergency notification system. Local law enforcement has also stepped in to help spread awareness: Parkesburg Borough Police broadcast the utility's notice locally, specifically instructing landlords to inform their tenants of the restrictions — a detail underscoring the effort to reach renters who might not directly receive utility company notifications.
No Timeline for When It Will Be Lifted
As of this writing, Pennsylvania American Water has not provided a specific timeline for how long the mandatory conservation order will remain in effect. The company said it will provide updates as needed and notify customers directly once the order is lifted, with real-time alerts available at amwater.com/paaw/alerts.
Part of a Broader Pattern Across the Region
The Coatesville order isn't an isolated incident. A similar situation unfolded separately in Norristown, Pennsylvania, roughly 30 miles away in Montgomery County, where Pennsylvania American Water asked about 31,000 customers across Norristown, Bridgeport, and several surrounding townships to conserve water after heavy rains caused high turbidity in that system's raw water supply as well — suggesting the recent stretch of intense regional weather has placed similar strain on multiple treatment facilities across the utility's southeastern Pennsylvania service area.
About the Utility
Pennsylvania American Water is part of American Water (NYSE: AWK), the largest regulated water and wastewater utility company in the United States, with a history dating back to 1886. The company — celebrating its 140th anniversary in 2026 — provides drinking water and wastewater services to approximately 14 million people across regulated operations in 14 states and 18 military installations.
What's Next
With no estimated resolution timeline yet provided, affected residents in the Coatesville and Norristown areas are advised to continue monitoring Pennsylvania American Water's official alert channels for updates on when normal water usage can resume. For the utility's official statement and ongoing updates, see the Pennsylvania American Water newsroom.