Water heaters in Round Rock, Texas
Water hardness, permits, utilities and rebates for Round Rock, TX, each linked to the city or utility source.
Updated Researched by Strive LeadGenWilliamson County
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Short answer
Round Rock gets its water from City of Round Rock Utilities and Environmental Services, measured at 249 mg/L (very hard on the USGS scale). Hard water speeds up sediment buildup in a tank, so flushing and anode checks matter more here. Replacing a water heater needs a permit.
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Water Heater Plumbers serving Round Rock, not yet rated
These companies passed our license and record checks and say they serve Round Rock, but we have no Google rating for them yet, so they are not scored. A to Z, not ranked. No company here pays us.
- Efficient AC, Electric & Plumbing Based in Austin · License TSBPE Responsible Master Plumber M-21226 · Operating since 1976
Before you hire in Round Rock
From city, county and utility sources, checked Oct 14, 2026
- Water utilityCity of Round Rock Utilities and Environmental ServicesSource
- Water hardness249 mg/L (very hard on the USGS scale), 2025 water quality reportSource
- Water heater permitRequired. Who may pull it: Registered contractor via the City permit portal (standalone residential plumbing trade permit); tank-to-tankless replacement has its own application and needs a gas piping chart; homeowners referred to the Homeowner Projects page. Fee: Residential standalone trade permit $50.00Source
- Electric utilityOncor Electric Delivery (wires/TDU; retail choice) serves much of the citySource
- Utility rebatesOncor ENERGY STAR heat pump water heater: $500 off coupon. Rules: Oncor residential customers; reserve coupon through Oncor Marketplace (CLEAResult) and redeem online or in-store at participating retailers (Home Depot, Lowes); limit per householdSource
- Utility rebatesAtmos Energy (Mid-Tex Division) natural gas storage tank water heater: $100 (0.68 UEF+); $150 (0.86 UEF+, ENERGY STAR); $200 (0.90 UEF+, ENERGY STAR). Rules: Current Atmos Energy Mid-Tex residential customer; apply within 12 months of purchase/installation; Atmos Energy (Mid-Tex Division) natural gas tankless water heater: $200 (0.87 UEF+); $300 (0.95 UEF+, ENERGY STAR). Rules: SameSource
Read before you hire
- How much does it cost to replace a water heater in 2026?
- How long does a water heater last? Lifespan by type
- Why is my water heater popping or rumbling?
- What does an anode rod do, and when should it be replaced?
- How much does a tankless water heater cost installed?
- Is there still a federal tax credit for heat pump water heaters?
Other Texas cities
Water Heater Facts is an information and referral service run by Strive LeadGen LLC. Contractors may pay us when we connect a homeowner with one. Local facts come from city, county and utility sources linked above; rules change, so confirm with the city before you start.