Backflow testing in Florida
3 utility lists · 361 companies. Largest list: Hillsborough County Water Resources (251 companies). Your utility decides which testers it accepts, so start from the utility that sent your notice.
Utility lists in Florida, ranked by companies on the list
| Rank in state | Utility list | Area | Companies | Testers | vs national median | National rank (by companies) |
|---|---|---|---|---|---|---|
| 1 | Hillsborough County Water Resources | Tampa | 251 | Company-level list | 4.4× | 3 of 33 |
| 2 | City of Tampa Water Department | Tampa | 114 | Company-level list | 2× | 6 of 33 |
| 3 | City of Tallahassee Underground Utilities, Cross Connection Control | Tallahassee | 45 | Company-level list | 0.8× | 21 of 33 |
Computed from the 3 Florida 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: 5 entries for an individual tester with no company named and 31 entries for companies named after a person; we count those but do not republish them.
How current each list is
| Utility list | Version as printed | Date and age | Fetched (UTC) | We re-check it every |
|---|---|---|---|---|
| Hillsborough County Water Resources | “JSON feed, newest record modified 2025-04-02” | 2025-04-02 (date of the newest record in the feed), 581 days before we fetched it; 18 of 22 by recency · Old list | 2026-11-04 | 365 days |
| City of Tampa Water Department | “9.14.26-revised” | The list prints no full date; see the version as printed | 2026-11-04 | 90 days |
| City of Tallahassee Underground Utilities, Cross Connection Control | “Revised January 2025” | The list prints no full date; see the version as printed | 2026-11-04 | 365 days |
Computed from the 3 Florida 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
The Florida lists print no town for the companies; this counts the area codes of their phone numbers instead: 361 of 361 companies show a phone here, with 30 area codes. The most common:
- Area code 813: 149 companies
- Area code 727: 50 companies
- Area code 850: 37 companies
- Area code 352: 20 companies
- Area code 941: 20 companies
- Area code 407: 18 companies
Computed from the 3 Florida utility lists above, as fetched 2026-11-04 (UTC). Area codes of the company phone numbers we publish; a company named on two lists counts once.
Companies on more than one list
49 companies of the 361 on Florida lists are named on more than one of them:
- City of Tampa Water Department and Hillsborough County Water Resources: 48 companies on both (42% of the first list, 19% of the second).
- Hillsborough County Water Resources and City of Tallahassee Underground Utilities, Cross Connection Control: 1 company on both (<1% of the first list, 2% of the second).
Also on a utility list in another state: 1 company (Georgia), 1 company (North Carolina).
Computed from the 3 Florida 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 Tallahassee Underground Utilities, Cross Connection Control prints service types: Irrigation 23, Domestic 23, Fire 19 (of 45 companies).
We do not republish expiry dates; open the utility’s own list to check them.
Computed from the 3 Florida 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: “plumbing” appears in 37% of company names on Florida lists, against 25% across all of them.
| Company name contains | Companies (361) | Share | Share, all 2,590 companies we hold |
|---|---|---|---|
| Plumbing | 134 | 37% | 25% |
| Backflow or cross-connection | 33 | 9% | 24% |
| Fire | 79 | 22% | 17% |
| Irrigation, lawn, landscape or sprinkler | 18 | 5% | 10% |
| Mechanical, heating or air | 14 | 4% | 6% |
Computed from the 3 Florida 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; 108 names here match none. The words say nothing about the quality of the work.
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