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Tap water quality report

Chester, PA

EPA monitoring detected 22 contaminants across the 1 water supplier serving Chester. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

1
water supplier
140,437
people served
22
contaminants found
Pennsylvania rankings Lead in Pennsylvania PFAS in Pennsylvania

What was found in Chester's water

The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
8390 µg/L 84%
of the EPA limit 10000 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Fluoride
772.35 µg/L 19%
of the EPA limit 4000 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Copper
312.5 µg/L 24%
of the EPA limit 1300 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
TTHM
75.9 µg/L 95%
of the EPA limit 80 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Chloroform
68.435 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
59.93 µg/L 100%
of the EPA limit 60 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Dichloroacetic Acid
31.425 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Lead
30.9 µg/L 206%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Barium
30.65 µg/L 1.5%
of the EPA limit 2000 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Trichloroacetic Acid
27.06 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Bromodichloromethane
11.845 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Monochloroacetic Acid
4.29 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Dibromochloromethane
2.9 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Monobromoacetic Acid
2.54 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Dibromoacetic Acid
1.265 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
Atrazine
0.6760 µg/L 23%
of the EPA limit 3 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
2,4-D
0.1800 µg/L 0.3%
of the EPA limit 70 µg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2019
1/1 SYR4
PFOA
0.0051 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2024
1/1 UCMR-5
Lead
0.0048 mg/L 32%
of the EPA limit 0.0150 mg/L
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2025
1/1 LCR
PFBS
0.0045 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2024
1/1 UCMR-5
Pfpea
0.0041 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2024
1/1 UCMR-5
Pfhxa
0.0039 µg/L
No EPA limit set
Main supplier: CHESTER WATER AUTHORITY · 140,437 people · 2024
1/1 UCMR-5
Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of the system's samples — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately. These are the utilities' own EPA-reported results, not a city-wide average. A detection means the lab measured the substance — it isn't the same as exceeding a legal limit. Hover a source tag to see the EPA program and years behind each figure.

Water suppliers serving Chester

SupplierPopulation served
CHESTER WATER AUTHORITY 140,437

Frequently asked questions about Chester tap water

Is Chester tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Chester. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.

How many water suppliers serve Chester?

1 public water supplier report drinking-water monitoring for Chester, Pennsylvania to the EPA. Each is listed above with its population served.

What contaminants are in Chester's water?

The contaminants EPA monitoring detected in Chester include Nitrate, Fluoride, Copper, TTHM, Chloroform. The full list, with the level at the main supplier and the data source, is in the table above.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.