Whole House Water Softeners in Southlake

Southlake takes all of its water from Fort Worth, and it arrives through two underground transmission pipelines, according to the city's own 2021 explainer on how water reaches the city. From there Southlake's system takes over: three major pump stations able to move more than 26 million gallons a day, ground and elevated storage totaling 21 million gallons in three ground tanks and four towers, and 302 miles of pipe from 6 to 42 inches serving more than 11,300 accounts across two pressure planes. The T.W. King pump station holds one 5-million-gallon tank and is slated for a second of the same size, a new pump and a backup generator in a three-phase improvement program. The lake that shares the neighboring city's name is not part of this: Grapevine's report says Lake Grapevine supplies Grapevine's own plant, while Southlake's report says the city gets all its water from Fort Worth's water department. Fort Worth's 2017 impact fee study lists Southlake as 100 percent Fort Worth-served, and the 2025 report records that no emergency interconnection was used that year. Two more documents fill in the hardware. Fort Worth delivers more than 3.02 billion gallons a year through those two lines, one of them built in 1986, and most of the local network dates from the 1990s and early 2000s. The station at 3200 West Southlake Boulevard holds two 5.0 million gallon ground tanks and seven pumps split between an upper and a lower plane; T.W. King holds a third 5.0 million gallon ground tank and three 4,000 gallon-a-minute pumps; the four elevated tanks of 1.5 million gallons each stand two on North White Chapel Boulevard, one on Brewer Road and one on Miron Drive. An emergency connection from Grapevine exists on paper only.

The secondary constituents in Southlake's report are Fort Worth's results, and they put total hardness as calcium carbonate at 108 to 150 mg/L, or 6 to 9 grains per gallon, for 2025. Calcium at 37.6 to 48.1 mg/L and magnesium at 3.45 to 7.35 mg/L are the hardness minerals; bicarbonate at 99.7 to 120 mg/L, total alkalinity at 99.7 to 124 mg/L, sulfate at 17.3 to 40.9 mg/L and chloride at 16.3 to 31.8 mg/L travel with them; total dissolved solids run 182 to 244 mg/L. The same page explains the occasional earthy or musty taste as algae that grow naturally in one of the source lakes, Eagle Mountain Lake among them, which is as close as the report comes to saying which Fort Worth reservoir is in Southlake's blend. On the USGS scale the low end, 108, is moderately hard and the high end, 150, is hard.

Two pressure planes and a set of ground tanks and towers mean Southlake water is pumped up, stored and then falls by gravity to the tap, which changes pressure but not minerals: a home on either plane gets the same Fort Worth range. What shifts the figure is the season and which Fort Worth plant and lake blend is feeding the two transmission lines that month. Southlake's own crews write the water quality report from Fort Worth's data, so the range is the supplier's honest description and the city adds no figure of its own. For the softener, the 150 mg/L end, about 8.8 grains to the gallon, is the figure to size to so the unit keeps up in the harder months, and the free water test settles what your own tap carries today.

Sources: City of Southlake, 2025 Water Quality Report · City of Southlake: How is Water Delivered to Southlake? · City of Southlake: Southlake Water Facts · City of Southlake: Water Service and Meters · City of Southlake: T.W. King Pumpstation Improvements · City of Grapevine, 2025 Water Quality Report · City of Fort Worth, Water Impact Fee Update · USGS Water Science School: Hardness of Water · EPA SDWIS via Envirofacts REST, water system facility records records for PWS TX2200075 · City of Southlake, FY2026 Capital Improvements Program