St. Hedwig, TX tap water
Supplied mostly by East Central SUD, plus 1 other utility. Here's what the water means for your fish.
Disinfectant
Chlorine
Your water is treated with chlorine. It slowly gases off from standing water, and any water conditioner removes it.
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)
Supplier's figureUp to 9.7 ppm (Low)
Typical 6.3 ppm
Water changes can't take your tank's nitrate below this level.
From the utility that supplies yours: Crwa Wells Ranch and San Antonio Water System and Crwa Lake Dunlap WTP, which supplies East Central SUD; EPA monitoring data (2012–2019).
Water chemistry
General hardness
Supplier's figure257–343 ppm
Typical 300 ppm
Hard. Ideal for livebearers and African cichlids. Soft-water species may struggle to breed.
From the utility that supplies yours: San Antonio Water System, which supplies East Central SUD.
Carbonate hardness (alkalinity)
141–250 ppm
Typical 156 ppm
Strong buffering. pH stays steady and hard to lower without RO water.
From EPA monitoring data (2013–2019).
pH
7.3–8.3
Typical 7.8
Most community fish do well here. Stable water matters more than the exact number.
From EPA monitoring data (2019).
Who supplies St. Hedwig, TX
East Central SUD
Serves 84% of residents · Buys water from Crwa Wells Ranch · Chlorine
Green Valley SUD
Serves 11% of residents · Buys water from Crwa Wells Ranch · Chlorine
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.