Is Holyoke, MA Tap Water Safe? Quality & Contaminants

What was found in Holyoke'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.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	120 µg/L 1.2% of the EPA limit 10000 µg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	56 µg/L 93% of the EPA limit 60 µg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2019	1/1	SYR4
TTHM	45.25 µg/L 57% of the EPA limit 80 µg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2019	1/1	SYR4
Chloroform	43 µg/L No EPA limit set Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2018	1/1	SYR4
Dichloroacetic Acid	32.85 µg/L No EPA limit set Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2018	1/1	SYR4
Trichloroacetic Acid	23 µg/L No EPA limit set Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2018	1/1	SYR4
Lithium	10.7 µg/L No EPA limit set Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2024	1/1	UCMR-5
Di(2-ethylhexyl) Phthalate	5.26 µg/L 88% of the EPA limit 6 µg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2019	1/1	SYR4
Monochloroacetic Acid	3.3 µg/L No EPA limit set Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2018	1/1	SYR4
Bromodichloromethane	2.9 µg/L No EPA limit set Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2018	1/1	SYR4
Copper	2.26 µg/L 0.2% of the EPA limit 1300 µg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2018	1/1	SYR4
2,4-D	0.4390 µg/L 0.6% of the EPA limit 70 µg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2019	1/1	SYR4
Hexachlorocyclopentadiene	0.0959 µg/L 0.2% of the EPA limit 50 µg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2019	1/1	SYR4
Lead	0.0090 mg/L 60% of the EPA limit 0.0150 mg/L Main supplier: HOLYOKE WATER WORKS · 37,838 people · 2023	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 Holyoke

Supplier	Population served
HOLYOKE WATER WORKS	37,838

Frequently asked questions about Holyoke tap water

Is Holyoke tap water safe to drink?

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

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

What contaminants are in Holyoke's water?

The contaminants EPA monitoring detected in Holyoke include Nitrate, Total Haloacetic Acids (HAA5), TTHM, Chloroform, Dichloroacetic Acid. 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.