Is Laconia, NH Tap Water Safe? Quality & Contaminants

What was found in Laconia'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
Fluoride	685 µg/L 17% of the EPA limit 4000 µg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2019 Highest in the city: 3735 µg/L — WINDEMERE RIDGE · 55 people · 2019	4/5	SYR4
Copper	82.3 µg/L 6.3% of the EPA limit 1300 µg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2019 Highest in the city: 141.5 µg/L — PENDLETON COVE · 204 people · 2019	5/5	SYR4
TTHM	92 µg/L 115% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Chloroform	83.7 µg/L No EPA limit set Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Barium	64.75 µg/L 3.2% of the EPA limit 2000 µg/L Highest in the city: PENDLETON COVE · 204 people · 2019	3/5	SYR4
Lead	9.2 µg/L 61% of the EPA limit 15 µg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2017 Highest in the city: 45.16 µg/L — PENDLETON COVE · 204 people · 2019	5/5	SYR4
Total Haloacetic Acids (HAA5)	25.3 µg/L 42% of the EPA limit 60 µg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Trichloroacetic Acid	14 µg/L No EPA limit set Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Dichloroacetic Acid	13.4 µg/L No EPA limit set Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Bromodichloromethane	8.275 µg/L No EPA limit set Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Combined Uranium	6.665 µg/L 22% of the EPA limit 30 µg/L Highest in the city: WINDEMERE RIDGE · 55 people · 2017	2/5	SYR4
Gross Alpha, Excl. Radon And U	4.7 pCi/L 31% of the EPA limit 15 pCi/L Highest in the city: WINDEMERE RIDGE · 55 people · 2017	2/5	SYR4
P-Dichlorobenzene	3.6 µg/L 4.8% of the EPA limit 75 µg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Chromium	3 µg/L 3% of the EPA limit 100 µg/L Highest in the city: WINDEMERE RIDGE · 55 people · 2019	1/5	SYR4
Arsenic	2.19 µg/L 22% of the EPA limit 10 µg/L Highest in the city: WENTWORTH COVE ESTATES · 140 people · 2018	3/5	SYR4
Combined Radium (-226 And -228)	1.7 pCi/L 34% of the EPA limit 5 pCi/L Highest in the city: WENTWORTH COVE ESTATES · 140 people · 2016	3/5	SYR4
Dibromochloromethane	1.105 µg/L No EPA limit set Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Dichloromethane	0.9000 µg/L 18% of the EPA limit 5 µg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2019	1/5	SYR4
Lead	0.0040 mg/L 27% of the EPA limit 0.0150 mg/L Main supplier: LACONIA WATER WORKS · 17,125 people · 2023 Highest in the city: 0.0720 mg/L — MOUNTAIN VIEW APTS · 100 people · 2020	4/5	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 Laconia

Supplier	Population served
LACONIA WATER WORKS	17,125
PENDLETON COVE	204
WENTWORTH COVE ESTATES	140
MOUNTAIN VIEW APTS	100
WINDEMERE RIDGE	55

Frequently asked questions about Laconia tap water

Is Laconia tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Laconia. 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 Laconia?

5 public water suppliers report drinking-water monitoring for Laconia, New Hampshire to the EPA. Each is listed above with its population served.

What contaminants are in Laconia's water?

The contaminants EPA monitoring detected in Laconia include Fluoride, Copper, TTHM, Chloroform, Barium. 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.