Four Corners, TX tap water
Supplied mostly by North Mission Glen MUD, plus 3 other utilities. Here's what the 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 (2012–2015).
Nitrate (NO₃)
Up to 2.7 ppm (Low)
Typical 1.5 ppm
Low, so water changes lower your tank's nitrate well.
From EPA monitoring data (2012–2019).
Water chemistry
General hardness
Supplier's figure43–183 ppm
Typical 118 ppm
Moderately soft to medium. Suits most community fish and plants.
From the utility that supplies yours: City of Houston, which supplies North Mission Glen MUD; City of Houston, which supplies Kingsbridge MUD; City of Houston, which supplies Fort Bend County MUD 119 (2024).
Carbonate hardness (alkalinity)
96–176 ppm
Typical 109 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2013–2019).
pH
Supplier's figure7.6
Most community fish do well here. Stable water matters more than the exact number.
From the utility that supplies yours: North Fort Bend Water Authority, which supplies North Mission Glen MUD; North Fort Bend Water Authority, which supplies Kingsbridge MUD; North Fort Bend Water Authority, which supplies Fort Bend County MUD 119 (2012).
Total dissolved solids
Supplier's figure144–321 ppm
Typical 203 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 Houston, which supplies North Mission Glen MUD; City of Houston, which supplies Kingsbridge MUD; City of Houston, which supplies Fort Bend County MUD 119 (2024).
- North Mission Glen MUD, Kingsbridge MUD, Fort Bend County Fwsd 2 and Fort Bend County MUD 119 soften their water at the plant, so it may be softer than the local groundwater.
Who supplies Four Corners, TX
North Mission Glen MUD
Serves 42% of residents · Buys water from North Fort Bend Water Authority · Chloramine
Kingsbridge MUD
Serves 34% of residents · Buys water from North Fort Bend Water Authority · Chloramine
Fort Bend County Fwsd 2
Serves 17% of residents · Groundwater (wells) · Chloramine
Fort Bend County MUD 119
Serves 8% of residents · Buys water from North Fort Bend 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.
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Compiled by Shoal & Stem from public records. Free to cite with a link.