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← St. John, IN

Tap water quality report

ZIP 46303 — St. John, IN

EPA monitoring across the 2 water suppliers serving ZIP 46303 in St. John, IN detected 18 contaminants. A detection doesn't automatically mean the water is unsafe — see the highest level found below, with the EPA limit for each.

2
water suppliers
30,300
people served
18
contaminants found

What was found in ZIP 46303

The highest level seen across the suppliers serving this ZIP, the EPA limit for each, and where the figure comes from.

ContaminantLevel vs EPA limitSuppliersSource
Copper
1000 µg/L 77%
of the EPA limit 1300 µg/L
 2/2 SYR4
Fluoride
800 µg/L 20%
of the EPA limit 4000 µg/L
 2/2 SYR4
Barium
410 µg/L 21%
of the EPA limit 2000 µg/L
 2/2 SYR4
Lithium
83.8 µg/L
No EPA limit set
 2/2 UCMR-5
TTHM
22.3 µg/L 28%
of the EPA limit 80 µg/L
 2/2 SYR4
Chromium
21 µg/L 21%
of the EPA limit 100 µg/L
 1/2 SYR4
Lead
17 µg/L 113%
of the EPA limit, in the worst sample — 15 µg/L
 2/2 SYR4
Total Haloacetic Acids (HAA5)
16.2 µg/L 27%
of the EPA limit 60 µg/L
 2/2 SYR4
Chloroform
9 µg/L
No EPA limit set
 1/2 SYR4
Bromodichloromethane
7.5 µg/L
No EPA limit set
 1/2 SYR4
Dibromochloromethane
5.9 µg/L
No EPA limit set
 1/2 SYR4
Gross Alpha, Excl. Radon And U
2.5 pCi/L 17%
of the EPA limit 15 pCi/L
 2/2 SYR4
Xylenes, Total
2.3 µg/L 0%
of the EPA limit 10000 µg/L
 1/2 SYR4
Di(2-ethylhexyl) Phthalate
2.1 µg/L 35%
of the EPA limit 6 µg/L
 2/2 SYR4
Bromoform
1.7 µg/L
No EPA limit set
 1/2 SYR4
Di(2-ethylhexyl) Adipate
0.7000 µg/L 0.2%
of the EPA limit 400 µg/L
 1/2 SYR4
Pentachlorophenol
0.1400 µg/L 14%
of the EPA limit 1 µg/L
 1/2 SYR4
Lead
0.0145 mg/L 97%
of the EPA limit 0.0150 mg/L
 2/2 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 single worst sample on record — over 100% is worth reading, but is not by itself a violation. Formal violations are listed separately.

Water suppliers serving ZIP 46303

SupplierStatePopulation served
ST. JOHN MUNICIPAL WATER UTILITY IN 25,700
CEDAR LAKE WATER WORKS IN 4,600

Frequently asked questions about ZIP 46303 tap water

Is the tap water in ZIP 46303 safe to drink?

EPA testing detected 18 contaminants across the water suppliers serving ZIP 46303. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.

Which water suppliers serve ZIP 46303?

2 public water suppliers report EPA drinking-water monitoring for ZIP 46303. Each is listed above with its population served.

What contaminants are in ZIP 46303's water?

EPA monitoring detected Copper, Fluoride, Barium, Lithium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.