Backflow testing in Texas
6 utility lists · 859 companies · 350 testers on the 2 lists that count testers. Largest list: City of Houston Public Works, Cross Connection Control Program (326 companies). Your utility decides which testers it accepts, so start from the utility that sent your notice.
Utility lists in Texas, ranked by companies on the list
| Rank in state | Utility list | Area | Companies | Testers | vs national median | National rank (by companies) |
|---|---|---|---|---|---|---|
| 1 | City of Houston Public Works, Cross Connection Control Program | Houston | 326 | Company-level list | 5.7× | 1 of 33 |
| 2 | City of Corpus Christi Water, Backflow Prevention Program | Corpus Christi | 273 | 296 | 4.8× | 2 of 33 |
| 3 | City of Galveston Development Services, Building Division | Galveston | 103 | Company-level list | 1.8× | 8 of 33 |
| 4 | City of Round Rock Utilities and Environmental Services | Round Rock | 98 | Company-level list | 1.7× | 9 of 33 |
| 5 | City of College Station Backflow Prevention and Cross-Connection Control | College Station | 51 | Company-level list | 0.9× | 18 of 33 |
| 6 | City of Burleson Public Works | Burleson | 34 | 54 | 0.6× | 24 of 33 |
Computed from the 6 Texas utility lists above, as fetched 2026-11-04 (UTC). National median: 57 companies per list across the 33 utility lists we hold (n=33). National rank 1 = the list naming the most companies; equal counts share a rank. Testers: only lists that name each company's testers carry a count. Not in the company counts: 26 entries for an individual tester with no company named and 8 entries for companies named after a person; we count those but do not republish them.
How many testers each company has
| Utility list | Testers with a company | Companies | Testers per company | One-tester companies | Largest company (testers) | National rank (testers per company) |
|---|---|---|---|---|---|---|
| City of Burleson Public Works | 54 | 34 | 1.6 | 23 (68%) | 5 | 4 of 13 |
| City of Corpus Christi Water, Backflow Prevention Program | 279 | 273 | 1 | 267 (98%) | 2 | 10 of 13 |
Computed from the 2 Texas utility lists above, as fetched 2026-11-04 (UTC). Median across the 13 tester-level lists we hold: 1.3 testers per company (n=13); rank 1 = most testers per company. Counts only: we never publish testers’ names.
How current each list is
| Utility list | Version as printed | Date and age | Fetched (UTC) | We re-check it every |
|---|---|---|---|---|
| City of Houston Public Works, Cross Connection Control Program | “October 2026 (generated 2026-10-01)” | 2026-10-01 (dated on the list), 34 days before we fetched it; 4 of 22 by recency | 2026-11-04 | 365 days |
| City of Round Rock Utilities and Environmental Services | “Revised 2026-06-29” | 2026-06-29 (dated on the list), 128 days before we fetched it; 10 of 22 by recency | 2026-11-04 | 180 days |
| City of Burleson Public Works | “last modified May 29, 2024” | 2024-05-29 (dated on the list), 889 days before we fetched it; 20 of 22 by recency · Old list | 2026-11-04 | 365 days |
| City of College Station Backflow Prevention and Cross-Connection Control | “registered as of 4/25/23” | 2023-04-25 (dated on the list), 1,289 days before we fetched it; 22 of 22 by recency · Old list | 2026-11-04 | 365 days |
| City of Corpus Christi Water, Backflow Prevention Program | “live registry as fetched (297 registered testers)” | Live directory: current on the day we read it, 2026-11-04 | 2026-11-04 | 90 days |
| City of Galveston Development Services, Building Division | “Registered Backflow Technician list (undated)” | The list prints no full date; see the version as printed | 2026-11-04 | 365 days |
Computed from the 6 Texas utility lists above, as fetched 2026-11-04 (UTC). Median age at fetch across the 22 lists we hold that carry a date: 206 days (n=22); rank 1 = the most recently dated list. A month-only or two-digit version (for example “7.2026”) is shown as printed and not turned into a date.
Where the listed companies are based
302 companies on Texas lists print a town (302 of 859), spread over 116 towns. The most common:
- Corpus Christi: 61 companies
- San Antonio: 31 companies
- Houston: 22 companies
- Dallas: 9 companies
- Fort Worth: 7 companies
- Austin: 6 companies
- City of Burleson Public Works: 3 of 31 companies with a printed town (10%) are in Burleson, the utility’s home city.
- City of Corpus Christi Water, Backflow Prevention Program: 61 of 273 companies with a printed town (22%) are in Corpus Christi, the utility’s home city.
Based outside Texas: 1 company in Utah.
Computed from the 6 Texas utility lists above, as fetched 2026-11-04 (UTC). Towns as each list prints them; a company named on two lists counts once.
Companies on more than one list
25 companies of the 859 on Texas lists are named on more than one of them:
- City of Burleson Public Works and City of Corpus Christi Water, Backflow Prevention Program: 2 companies on both (6% of the first list, 1% of the second).
- City of College Station Backflow Prevention and Cross-Connection Control and City of Galveston Development Services, Building Division: 2 companies on both (4% of the first list, 2% of the second).
- City of College Station Backflow Prevention and Cross-Connection Control and City of Houston Public Works, Cross Connection Control Program: 5 companies on both (10% of the first list, 2% of the second).
- City of College Station Backflow Prevention and Cross-Connection Control and City of Round Rock Utilities and Environmental Services: 1 company on both (2% of the first list, 1% of the second).
- City of Galveston Development Services, Building Division and City of Houston Public Works, Cross Connection Control Program: 16 companies on both (16% of the first list, 5% of the second).
- City of Houston Public Works, Cross Connection Control Program and City of Round Rock Utilities and Environmental Services: 1 company on both (<1% of the first list, 1% of the second).
Computed from the 6 Texas utility lists above, as fetched 2026-11-04 (UTC). Matched by our company record (same name plus a shared ZIP code or phone number on the lists).
What the lists print beyond names
- City of College Station Backflow Prevention and Cross-Connection Control prints service types: General 31, Fireline 22 (of 51 companies).
- City of Galveston Development Services, Building Division prints service types: Fire system 35 (of 103 companies).
- City of Houston Public Works, Cross Connection Control Program prints an insurance expiry date for 326 of 326 companies.
- City of Round Rock Utilities and Environmental Services prints service types: Commercial 94, Residential 83, Fire 31 (of 98 companies).
We do not republish expiry dates; open the utility’s own list to check them.
Computed from the 6 Texas utility lists above, as fetched 2026-11-04 (UTC).
What kind of businesses are on the lists
The biggest difference from all the lists we hold: “fire” appears in 24% of company names on Texas lists, against 17% across all of them.
| Company name contains | Companies (859) | Share | Share, all 2,590 companies we hold |
|---|---|---|---|
| Plumbing | 165 | 19% | 25% |
| Backflow or cross-connection | 153 | 18% | 24% |
| Fire | 205 | 24% | 17% |
| Irrigation, lawn, landscape or sprinkler | 112 | 13% | 10% |
| Mechanical, heating or air | 30 | 3% | 6% |
Computed from the 6 Texas utility lists above, as fetched 2026-11-04 (UTC). A company named on two lists counts once. A name can match more than one row; 232 names here match none. The words say nothing about the quality of the work.
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