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Tap water quality report

Winterthur, DE

EPA monitoring detected 14 contaminants across the 1 water supplier serving Winterthur. 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
687
people served
14
contaminants found
Delaware rankings Lead in Delaware PFAS in Delaware

What was found in Winterthur'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
1077.7 µg/L 11%
of the EPA limit 10000 µg/L
Main supplier: WINTERTHUR · 687 people · 2019
1/1 SYR4
Nitrate-Nitrite
1046.62 µg/L 10%
of the EPA limit 10000 µg/L
Main supplier: WINTERTHUR · 687 people · 2019
1/1 SYR4
Copper
102.925 µg/L 7.9%
of the EPA limit 1300 µg/L
Main supplier: WINTERTHUR · 687 people · 2018
1/1 SYR4
Barium
18.6 µg/L 0.9%
of the EPA limit 2000 µg/L
Main supplier: WINTERTHUR · 687 people · 2016
1/1 SYR4
TTHM
5.906 µg/L 7.4%
of the EPA limit 80 µg/L
Main supplier: WINTERTHUR · 687 people · 2017
1/1 SYR4
Chloroform
2.3 µg/L
No EPA limit set
Main supplier: WINTERTHUR · 687 people · 2019
1/1 SYR4
Bromodichloromethane
2.0025 µg/L
No EPA limit set
Main supplier: WINTERTHUR · 687 people · 2019
1/1 SYR4
Dibromochloromethane
1.603 µg/L
No EPA limit set
Main supplier: WINTERTHUR · 687 people · 2019
1/1 SYR4
Lead
1.4 µg/L 9.3%
of the EPA limit 15 µg/L
Main supplier: WINTERTHUR · 687 people · 2018
1/1 SYR4
Dichloroacetic Acid
1.24 µg/L
No EPA limit set
Main supplier: WINTERTHUR · 687 people · 2017
1/1 SYR4
Total Haloacetic Acids (HAA5)
1.24 µg/L 2.1%
of the EPA limit 60 µg/L
Main supplier: WINTERTHUR · 687 people · 2017
1/1 SYR4
Di(2-ethylhexyl) Phthalate
0.8000 µg/L 13%
of the EPA limit 6 µg/L
Main supplier: WINTERTHUR · 687 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
0.3080 pCi/L 6.2%
of the EPA limit 5 pCi/L
Main supplier: WINTERTHUR · 687 people · 2016
1/1 SYR4
Lead
0.0120 mg/L 80%
of the EPA limit 0.0150 mg/L
Main supplier: WINTERTHUR · 687 people · 2024
1/1 LCR
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 Winterthur

SupplierPopulation served
WINTERTHUR 687

Frequently asked questions about Winterthur tap water

Is Winterthur tap water safe to drink?

EPA testing detected 14 contaminants in the water serving Winterthur. 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 Winterthur?

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

What contaminants are in Winterthur's water?

The contaminants EPA monitoring detected in Winterthur include Nitrate, Nitrate-Nitrite, Copper, Barium, TTHM. 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.