In Round Rock, electric delivery is handled by Oncor — and since Round Rock sits in Texas's deregulated market, you pick your own Round Rock retail plan; Texas Gas Service is Round Rock's natural-gas utility; City of Round Rock handles Round Rock's water and sewer. The exact lineup depends on your Round Rock address — even nearby Austin and Killeen answer differently.
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Round Rock, just north of Austin, lives on the other side of the deregulation line from its famous neighbor: most Round Rock addresses choose a retail electricity plan, while Austin addresses a few miles south cannot. Water comes from the city, and the borders with Pflugerville, Hutto and Cedar Park each bring their own arrangements.
Round Rock's calendar runs on heat. By the time the Round Rock Express open their summer homestand at Dell Diamond, air conditioners across the city are working around the clock, and the retail electricity plan you picked back in the mild spring is suddenly the line item that matters — Oncor delivers the power regardless of which plan you chose. Most household moves cluster into those same scorching months, timed to the school year, so it pays to start water and sewer accounts with the City of Round Rock before your truck arrives rather than after. Natural gas, handled separately through Texas Gas Service, mostly waits for its moment: the handful of January cold snaps when furnaces and water heaters earn their keep.
| Utility | Provider | Phone | Start service |
|---|---|---|---|
| ⚡ Electricity |
Oncor
Delivery utility — you choose your plan |
(888) 313-6862 | Provider site |
| 🔥 Natural gas | Texas Gas Service | (800) 700-2443 | Provider site |
| 💧 Water | City of Round Rock Municipal | (512) 218-5460 | Provider site |
| 🚽 Sewer | City of Round Rock Municipal | (512) 218-5460 | Provider site |
Based on 10 sampled Round Rock addresses spanning ZIP codes 78664, 78665, 78681 (2026-07-20). Yours may differ — the Round Rock lookup is the tiebreaker.
The Austin–Round Rock boundary is one of the sharpest utility lines in Texas — crossing it changes the entire electricity model.
The one-minute fix: run your Round Rock address through the lookup and skip the guessing.
Oncor — Round Rock's TDU — owns the wires here, the same delivery setup as Round Rock's neighbors Killeen and Waco, and restores Round Rock outages ((888) 313-6862) whoever you pay. Your separately chosen Round Rock plan (compare at Power to Choose) sets the rate on your Round Rock bill — full wires-vs-plans explainer here.
Round Rock plays by deregulated rules even though Austin next door doesn't — don't mix up the two cities' advice.
Oncor is the TDU for Round Rock — the wires-and-meters utility — at every one of the Round Rock addresses we sampled. You pick the retail plan that sets your Round Rock rate; Oncor delivers either way.
At every one of the Round Rock addresses we sampled, City of Round Rock was the water provider — sewer included. Other districts take over around Round Rock's edges, so check your block.
No — at every one of the sampled Round Rock addresses, Texas Gas Service was the gas utility, but plenty of Round Rock homes are all-electric and never open this account.
They're on opposite sides of Texas's deregulation line: Round Rock addresses in our sampling are in retail-choice territory with Oncor delivering, while Austin runs a municipal utility with no plan shopping. Moving between the two cities means switching models entirely.
The City of Round Rock, at every address we sampled. Its neighbors — Pflugerville, Hutto, Cedar Park — each run their own systems, so the city boundary is the water boundary.
The Round Rock addresses in our sampling all returned Oncor delivery with retail choice — Austin Energy's territory ends at Austin's service-area boundary, not at the 'Welcome to Round Rock' sign. A few blocks matter here, so check the specific building.
No — gas is a separate setup. Texas Gas Service was the natural gas provider at every Round Rock address we sampled, and it has nothing to do with whichever retail electricity plan you pick for your Oncor-delivered power. Some Round Rock homes are all-electric, so check whether your place actually has gas appliances before opening an account. The lookup shows what your specific address needs.
One minute with the Round Rock lookup above returns your Round Rock address's exact providers, phone numbers included.
Moving somewhere just outside Round Rock? Providers likely differ:
Round Rock-level lists can't be precise. Your Round Rock address can.
Find my providersRound Rock provider data comes from our address-level utility lookup engine — 10 Round Rock sample addresses spread across ZIPs 78664, 78665, 78681, refreshed 2026-07-20. Individual Round Rock addresses vary — check yours directly. Here's how we verify Round Rock provider data.