Herculaneum, MO tap water
Supplied mostly by Herculaneum PWS, plus 2 other utilities. Here's what the water means for your fish.
Disinfectant
Chlorine or chloramine
Utilities here use chlorine or chloramine, depending on which one serves your address. Chlorine slowly gases off from standing water; chloramine doesn't.
Safety for fish and shrimp
Nitrate (NO₃)
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
Water chemistry
General hardness
Not published yet
We haven't found this number yet. A drop test kit gives you your exact reading.
Carbonate hardness (alkalinity)
Supplier's figure203 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From the utility that supplies yours: Jefferson County Water Authority, which supplies Herculaneum PWS; Jefferson County Water Authority, which supplies Festus PWS (2016).
pH
Supplier's figure7.2–8.8
Typical 8.8
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From the utility that supplies yours: Jefferson County Water Authority, which supplies Herculaneum PWS; EPA monitoring data; Jefferson County Water Authority, which supplies Festus PWS (2012–2019).
- Herculaneum PWS and Festus PWS soften their water at the plant, so it may be softer than the local groundwater.
Who supplies Herculaneum, MO
Herculaneum PWS
Serves 57% of residents · Buys water from Jefferson County Water Authority · Chloramine
Jefferson County Pwsd 7
Serves 18% of residents · Groundwater (wells) · Chlorine
Festus PWS
Serves 16% of residents · Buys water from Jefferson County Water Authority · Chloramine
Our data comes from public records and is still incomplete. Many utilities don't publish every number, so we're adding more all the time. Your city's range is a starting point: testing your own tap is the only way to know exactly what's in it.
Tap water lookup covers US cities only for now. Want to know why it matters? Read our story on tap water.
Compiled by Shoal & Stem from public records. Free to cite with a link.