Hard Water in New Braunfels, and What to Do About It

New Braunfels Utilities last published a hardness range of 8.1 to 19.5 grains per gallon, averaging 15.1, in its 2019 report on 2018 water. NBU says groundwater is the harder part of its supply and hardness shifts with location, source and season. A single-tank softener typically costs $650–$1,500 installed (Fixr).

A river and two aquifers

According to NBU's 2025 Water Quality Report, most of the city's tap water is treated at the Gruene Road Surface Water Treatment Plant, which draws from the Guadalupe River. NBU also pumps groundwater from the Edwards Aquifer and the Trinity Aquifer, and it has agreements to buy water from Green Valley Special Utility District and the Guadalupe-Blanco River Authority when needed. In all, it has 54,575 acre-feet available, and TCEQ rates the system Superior.

River water and well water don't carry the same minerals. NBU's own hard-water page says the groundwater has more calcium and magnesium, and that hardness varies with location, source and season. So the hardness at your faucet can move when the source behind it changes.

The published hardness figure is from 2018

The last NBU report to print a hardness number was the 2019 Consumer Confidence Report, covering 2018: 8.1 to 19.5 grains per gallon, averaging 15.1. Back then the supply totaled 29,942 acre-feet, from the Gruene plant plus five Edwards wells and six Trinity wells. The reports since then leave hardness out, and the supply has grown by more than 24,000 acre-feet with new sources added.

None of that makes the old range useless. It tells you New Braunfels water is hard, sometimes very hard. It just can't tell you the exact figure at your address this month, which is why sizing starts with a test.

Ways to treat New Braunfels water

• Installing a water softenerNewer homes, valve settings for a shifting supply, and the permit.
• Whole-house water filtersCarbon for disinfectant taste, byproducts and PFAS questions.
• Reverse osmosis systemsSink-mounted or whole-house, and what each costs to run.
• Water softener repairQuick checks, common fixes, and the repair-or-replace call.
• What softeners cost in New BraunfelsInstalled ranges with sources, from salt-free to combined systems.

Understand the NBU report

• New Braunfels water quality report, explainedSources, hardness history, disinfectant, PFAS and lead.

Hard or very hard changes the equipment

Multiply grains per gallon by 17.12 to get milligrams per liter. NBU's 8.1 low end is about 139 mg/L, which the U.S. Geological Survey calls hard. The 15.1 average is about 259 mg/L and the 19.5 top about 334 mg/L, both well into the USGS very hard band, which begins above 180.

For a three-person home using around 225 gallons a day at the 15.1 average, that is roughly 3,400 grains a day. A 32,000-grain softener at full rating would go about nine days between cycles, so a modest single tank often fits. The catch is the valve setting: a metered valve counts gallons but relies on the hardness number it was given. Program it for the harder readings, not the average, and your water stays soft when the source behind your tap changes. The water softener installation guide for New Braunfels covers that setup.

Not everyone in town is on NBU

The City of New Braunfels says NBU supplies most of the city. It also names four other suppliers for surrounding areas: Crystal Clear Water Supply Corporation to the northeast, Green Valley Special Utility District to the southeast, Springs Hill Water Supply Corporation along SH 46 South toward Seguin, and Canyon Lake Water Service Company out FM 306 to the west. Your bill shows which one serves you. The figures on this site are NBU's; other suppliers publish their own reports.

How this site works

New Braunfels Water Softener Co. publishes information; it doesn't sell or install equipment. A request for a free test is forwarded to a single independent specialist in the area, vetted beforehand, who contacts you by phone. Texas licenses paid water treatment installs through TCEQ's Water Treatment Specialist program, with licensed plumbers exempt, and the City of New Braunfels requires a permit to install, alter or replace a plumbing system. It's reasonable to ask for both the license number and the permit plan up front.