Is Moon, PA tap water safe?

Data: U.S. EPA · How we read the data · How we check it

Moon Township Municipal Authority, the largest system here, had PFAS above the 2024 federal limits (PFOS) in EPA's 2023–2025 testing.

Is it an emergency? No: PFAS limits are about years of exposure, not a glass of water, and nothing in EPA's data calls for you to stop drinking the water today. If your utility issues a boil-water or do-not-drink notice, follow it.

6 public water systems serve parts of Moon. The largest, Moon Township Municipal Authority, serves 38,000 people, and 2 systems here had PFAS above a federal limit. Your water bill names your system.

Largest system

Moon Township Municipal Authority

38,000 people · Surface water · EPA ID PA5020011

Buys treated water from Coraopolis Water & Sewer Authority, Robinson Township Municipal Authority, Creswell Heights Joint Authority, Western Allegheny County Municipal Authority.

PFAS	Highest average	Limit	Status
PFOA Not detected	–	4 ppt	Not detected
PFOS Above limit	7.63 ppt	4 ppt	Above limit
PFHxS Detected, below limit	5.17 ppt	10 ppt	Detected, below limit
PFNA Not detected	–	10 ppt	Not detected
HFPO-DA (GenX) Not detected	–	10 ppt	Not detected

ppt = parts per trillion. "Highest average" is the highest average at any of the system's entry points, the way EPA compares results with the limits.

For context: the PFOS average is higher than at 88% of the Pennsylvania systems EPA tested.

Lead: 1.87 ppb at the 90th percentile (Sep 2025, and 9 in 10 homes sampled were at or below it) Below action level
Health-based violations since 2016: 1

Full Moon Township Municipal Authority results

Across Pennsylvania, 85 of 360 water systems EPA tested had PFAS above a 2024 federal limit, and 76 systems were above the lead action level in results from the last five years. Pennsylvania results.

Moon homes and lead pipes

57%

of homes built before 1980 (Pennsylvania 67%, US 50%)

built before 1950 (Pennsylvania 32%)

22%

of households rent (Pennsylvania 31%)

Lead service lines and lead solder were allowed until 1986, so homes from before then are the ones to check. How to check your own line.

Housing: Census American Community Survey 2020–2024 5-year estimates for Moon township (tables B25034, B25003). Estimates for small places have a margin of error.

Other water systems serving Moon

Robinson Township Municipal Authority
16,354 people · Surface water · Pennsylvania · reported ZIPs here
No PFAS above limits
Creswell Heights Joint Authority
15,000 people · Groundwater · Pennsylvania · reported ZIPs here
No PFAS above limitsAlso: 1 health-based violation since 2016
Findlay Township Municipal Authority
11,460 people · Purchased surface water · Pennsylvania · reported ZIPs here
Total trihalomethanes (TTHM) violation
Municipal Water Auth Adams Township
8,700 people · Purchased surface water · Pennsylvania · reported ZIPs here
Coliform bacteria violation
Coraopolis Water & Sewer Authority
5,804 people · Purchased surface water · Pennsylvania · reported ZIPs here
PFOA above limitAlso: PFOS above limit · PFHxS detected

How nearby cities compare

City	Main water system	PFAS	Lead (90th pct.)
Ross 10 mi West View Water Authority	West View Water Authority	None above limits	0 ppb
Shaler 13 mi Pittsburgh Water & Sewer Authority	Pittsburgh Water & Sewer Authority	None above limits	2 ppb
Pittsburgh 13 mi Pennsylvania American Water – Pittsburgh	Pennsylvania American Water – Pittsburgh	None above limits	4 ppb
Cranberry 15 mi West View Water Authority	West View Water Authority	None above limits	0 ppb
Bethel Park 16 mi Pennsylvania American Water – Pittsburgh	Pennsylvania American Water – Pittsburgh	None above limits	4 ppb
Plum 24 mi Plum Borough Municipal Authority	Plum Borough Municipal Authority	None above limits	3.7 ppb

Moon ZIP codes (1)

15108

Questions

Is Moon tap water safe to drink?

Moon Township Municipal Authority had 1 health-based violation since 2016, and EPA testing found PFAS above the 2024 federal limits, which it must meet by 2029. Utility data can't show lead from your own pipes: if your home was built before 1986, test your tap. Your utility's annual Consumer Confidence Report is the official summary.

Who supplies water in Moon, PA?

6 public water systems serve parts of Moon. The largest is Moon Township Municipal Authority (38,000 people). Your water bill names your system. The EPA ID is also on your utility's Consumer Confidence Report.

Does Moon tap water have PFAS?

Yes. EPA's 2023–2025 testing found entry-point averages above the 2024 federal limits for PFOS at Moon Township Municipal Authority. Systems have until 2029 to meet them.

Do Moon homes have lead pipes?

Census estimates put 57% of Moon homes as built before 1980 (Pennsylvania: 67%). Lead service lines and lead solder were allowed until 1986, so older homes are more likely to have them. Moon Township Municipal Authority's service line inventory says what your line is made of. The only way to know for your home is to check the line where it enters the house and test your tap.

Source: U.S. EPA drinking water records and PFAS testing (UCMR 5). How we read the data.