Is Pittsburgh, PA Tap Water Safe to Drink?

Where Does Pittsburgh Get Its Water?

Pittsburgh, PA draws its drinking water from surface water sources, primarily the rivers and watersheds of the greater Allegheny County area. The two largest systems serving city and suburban residents are the Pittsburgh Water and Sewer Authority and Pennsylvania American Water's Pittsburgh district. Several smaller municipal authorities, including West View Water Authority and Wilkinsburg-Penn Joint Water Authority, serve specific neighborhoods and adjacent communities.

The Pittsburgh Water and Sewer Authority operates the Pittsburgh Water Treatment Plant as a primary treatment facility. Pennsylvania American Water runs the Robinson Water Treatment Plant, among other facilities. West View Water Authority operates the Beaver Water Treatment Plant clearwell system. These plants collectively handle treatment for the majority of Pittsburgh-area tap water.

Additional water is provided to parts of the metro area through interconnections and smaller systems, including Neville Township Water Department, Reserve Township Water Department, Findlay Township Municipal Authority, and Robinson Township Municipal Authority. Hospital campuses and the Pittsburgh International Airport operate their own registered water systems but draw from the regional supply network.

How Is Pittsburgh Tap Water Treated?

Pittsburgh-area water undergoes a multi-step treatment process. Coagulation helps clump together fine particles so they can be removed, and filtration further clarifies the water. Granular activated carbon is used at several facilities, which is effective at reducing organic compounds, certain PFAS chemicals, and taste and odor issues. Powdered activated carbon is also applied as part of the treatment train at some plants.

Disinfection uses free chlorine and chloramines depending on the system and point in the distribution network. These disinfectants kill bacteria and viruses and help maintain water safety as it travels through pipes to your tap. Some facilities also use ultraviolet light or other disinfection steps as part of their treatment approach.

The treatment systems also include processes for managing sedimentation and turbidity. The combination of carbon-based filtration and multi-stage disinfection reflects the complexity of treating river-sourced water in an older urban and suburban infrastructure network.

What's in Pittsburgh Tap Water?

Lithium is the contaminant of greatest note in Pittsburgh's tap water based on recent EPA testing. The highest detected level was 19.6 micrograms per liter, nearly double the EPA health reference level of 10 micrograms per liter. Detections above that reference level were recorded across 3 ZIP codes. It is important to note that the 10 micrograms per liter figure is a non-regulatory screening benchmark, not an enforceable federal limit; no federal maximum contaminant level for lithium in drinking water currently exists.

PFOS, a widely studied type of PFAS chemical, was detected at a peak of 0.0057 micrograms per liter in at least one ZIP code. The EPA set a new federal maximum contaminant level for PFOS at 0.004 micrograms per liter, with utilities required to comply by 2031. That peak detection is above this new standard. Other PFAS compounds including PFTrDA, 8:2 FTS, and 6:2 FTS were detected but did not exceed their respective screening benchmarks in available samples.

PFAS chemicals are a large family of synthetic compounds used in industrial and consumer products for decades. They enter water supplies through industrial discharge, firefighting foam, and other environmental pathways. Lithium occurs naturally in some geological formations and can also enter surface water from industrial or agricultural sources.

Health Risk Profile for Pittsburgh

The PFOS detection above the new EPA federal standard is the primary regulatory concern for Pittsburgh tap water right now. The EPA limit of 0.004 micrograms per liter reflects health guidance around long-term PFOS exposure, which has been linked in research to immune system effects, thyroid disruption, and certain cancers. The peak detected value of 0.0057 micrograms per liter exceeds that limit, though utilities have until 2031 to achieve full compliance.

Lithium above the non-regulatory health reference level of 10 micrograms per liter is a secondary concern. The EPA uses this benchmark as a screening tool, not an enforceable standard. Research on lithium in drinking water at these concentrations is still evolving, but infants, pregnant individuals, and people with kidney conditions are generally considered more sensitive to lithium exposure and may want to take extra precaution.

A filter certified to NSF/ANSI 58 (reverse osmosis) or NSF/ANSI P473 is the most effective option for reducing PFAS including PFOS from tap water. NSF/ANSI is an independent third-party certification program; look for the NSF mark on the filter packaging to confirm it has been independently tested for the specific contaminants listed. For lithium, reverse osmosis filters rated under NSF/ANSI 58 also provide meaningful reduction.

For most healthy adults, short-term exposure at these detected levels is unlikely to cause acute harm. The concern is cumulative, long-term exposure. If you are pregnant, nursing, or have young children at home, using a certified filter for drinking and cooking water is a practical step while utilities work toward compliance with the new PFAS standards.