Meridian, CO tap water
Supplied by Meridian Md. Here's what its water means for your fish.
Disinfectant
Chloramine
Your water is treated with chloramine. Unlike chlorine, it doesn't gas off when water sits out, and many pitcher and fridge filters aren't rated to remove it. Conditioners that list chloramine on the label break it apart, which frees a little ammonia. Some utilities switch to plain chlorine for a few weeks a year.
Safety for fish and shrimp
Nitrite (NO₂)
Not detected (Low)
Not detected in testing, so any nitrite in your tank comes from the tank itself.
From EPA monitoring data (2012).
Nitrate (NO₃)
Not detected (Low)
Not detected in testing, so water changes lower your tank's nitrate well.
From EPA monitoring data (2012–2019).
Water chemistry
General hardness
Supplier's figure55–198 ppm
Typical 121 ppm
Moderately soft to medium. Suits most community fish and plants.
From the utility that supplies yours: City of Aurora and Denver Water Board, which supplies Meridian Md (2025).
Carbonate hardness (alkalinity)
Supplier's figure41–119 ppm
Typical 85 ppm
Moderate buffering. pH should stay fairly steady.
From the utility that supplies yours: East Cherry Creek Valley WSD and City of Aurora and Denver Water Board, which supplies Meridian Md (2017–2025).
pH
Supplier's figure8–8.3
Typical 8.1
Alkaline. Many utilities raise pH to protect pipes. Stability matters more than the exact number.
From the utility that supplies yours: City of Aurora, which supplies Meridian Md (2025).
Total dissolved solids
Supplier's figure98–355 ppm
Typical 230 ppm
A rough measure of everything dissolved in the water. RO water reads near 0, so TDS is a quick way to compare waters.
From the utility that supplies yours: City of Aurora and Denver Water Board, which supplies Meridian Md (2025).
- Meridian Md adds phosphate to protect pipes. It can feed algae in tanks without much plant growth.
- Meridian Md softens its water at the plant, so it may be softer than the local groundwater.
Who supplies Meridian, CO
Meridian Md
Serves 83% of residents · Buys water from Wise Project · 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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.