Tap WaterIndex

← Alaska

Tap water quality report

Petersburg, AK

EPA monitoring detected 15 contaminants across the 1 water supplier serving Petersburg. 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
3,218
people served
15
contaminants found
Alaska rankings Lead in Alaska PFAS in Alaska

What was found in Petersburg'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
Fluoride
700 µg/L 18%
of the EPA limit 4000 µg/L
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
TTHM
78.5 µg/L 98%
of the EPA limit 80 µg/L
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Chloroform
77.6 µg/L
No EPA limit set
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
62.39 µg/L 104%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Trichloroacetic Acid
51.15 µg/L
No EPA limit set
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Copper
25 µg/L 1.9%
of the EPA limit 1300 µg/L
Main supplier: PETERSBURG · 3,218 people · 2018
1/1 SYR4
Dichloroacetic Acid
20.075 µg/L
No EPA limit set
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Barium
8.8 µg/L 0.4%
of the EPA limit 2000 µg/L
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Lead
5.9365 µg/L 40%
of the EPA limit 15 µg/L
Main supplier: PETERSBURG · 3,218 people · 2018
1/1 SYR4
Dibromoacetic Acid
3.5 µg/L
No EPA limit set
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Monochloroacetic Acid
2.88 µg/L
No EPA limit set
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Bromodichloromethane
1.085 µg/L
No EPA limit set
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Xylenes, Total
1.0175 µg/L 0%
of the EPA limit 10000 µg/L
Main supplier: PETERSBURG · 3,218 people · 2019
1/1 SYR4
Combined Radium (-226 And -228)
0.1910 pCi/L 3.8%
of the EPA limit 5 pCi/L
Main supplier: PETERSBURG · 3,218 people · 2015
1/1 SYR4
Lead
0.0035 mg/L 23%
of the EPA limit 0.0150 mg/L
Main supplier: PETERSBURG · 3,218 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 Petersburg

SupplierPopulation served
PETERSBURG 3,218

Frequently asked questions about Petersburg tap water

Is Petersburg tap water safe to drink?

EPA testing detected 15 contaminants in the water serving Petersburg. 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 Petersburg?

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

What contaminants are in Petersburg's water?

The contaminants EPA monitoring detected in Petersburg include Fluoride, TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic 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.