Whole House Water Softeners in Irving

Irving's water is pumped nearly 75 miles before Dallas ever touches it. The city's 2025 water quality report traces the route: Jim Chapman Lake, on the South Sulphur River across Delta and Hopkins counties, east of Commerce and north of Sulphur Springs, then a pipeline through Hunt, Collin and Denton counties into Lewisville Lake, where the City of Dallas pulls it for treatment at the Elm Fork Water Treatment Plant. The first leg, 40 miles of 84-inch pipe from Chapman to Lake Lavon, was finished in 1996 as a joint project with the North Texas Municipal Water District; the second, 33 miles of 72-inch line from Lavon to Lewisville, started construction in 2001 and began delivering water in June 2003 at a capacity of 75 million gallons a day. Along the way sit a 12 million gallon balancing reservoir at Merit, a 1 million gallon control tank at Prosper and a booster station at Princeton. Dallas and Irving approved their treatment contracts in 1998, and in February 2025 the line was tied to a new 32-mile pipeline from Lake Ralph Hall. The lake itself held 294,498 acre-feet at its conservation level in a 2022 survey and supplies the water district, the Sulphur River district and Irving.

None of that changes the fact that what comes out of an Irving tap is Dallas-treated water. Irving's report says plainly that its water is processed by the City of Dallas and arrives ready to distribute, and that secondary constituents such as calcium, sodium and iron are regulated by the state rather than the EPA and are not required in the report; it prints none, and this page therefore prints none for Irving. Chapman water does not reach the Elm Fork plant alone, either: it flows into Lewisville Lake and is drawn from there with the Elm Fork water Dallas already treats from lakes Ray Roberts, Lewisville and Grapevine, as the city's December 2023 memorandum describes. The supplier's figure is therefore the relevant one: Dallas gives 120 to 155 mg/L as calcium carbonate for its system, between 7 and 9 grains per gallon, and the USGS scale places all but the bottom of it, everything above 120, in the hard band.

For an Irving homeowner the ownership of the lake matters for the bill and the long term, and the Elm Fork plant matters for the glass of water. Every tap in the city is on that plant's output, so the hardness does not change from one end of Irving to the other except as the lake blend and the season change it. Chapman is one lake in that blend, and no published figure separates its water from the rest. A softener in Irving is sized for 9 grains, the top of Dallas's range, and the free water test supplies the Irving-specific number that no published report yet prints.

Sources: City of Irving 2025 Water Quality Report · City of Irving, The Story Behind the Irving Water Supply Project · City of Irving, Irvings Water Supply · Texas Water Development Board, Jim Chapman Lake · City of Dallas memorandum, December 1, 2023