Where Texas aerobic maintenance providers are based

Key findings

1. 1,357 licensed OSSF maintenance providers and 1,188 maintenance technicians have a Texas county on their license, the county of their mailing address.
2. Providers are based in 152 of Texas’s 254 counties. Montgomery County has the most, 75, and the ten counties with the most hold 27.1% of all providers.
3. 25 counties permitted aerobic systems from 2015 to 2025 but have no maintenance provider based in them: 2,427 aerobic authorizations between them, so any provider working there is based in another county.
4. Statewide there were about 215 aerobic authorizations recorded by county from 2015 to 2025 for each provider. Across the 8 TCEQ regions with at least 50 providers it runs from about 150 in Region 14 (Corpus Christi) to about 280 in Region 04 (DFW Metroplex), on permits recorded by county.

By TCEQ region

Providers usually work within reach of their base, so a region is a fairer unit than a county for comparing providers with permits. Permits per provider is shown only where at least 50 providers are based, and it leaves out systems a TCEQ regional office permits directly (see method and limits), so it is a floor, not an exact figure.

Counties with aerobic permits and no provider based there

25 counties permitted aerobic systems from 2015 to 2025 but have no maintenance provider based in them: 2,427 aerobic authorizations between them, so any provider working there is based in another county.

All 254 counties

Sorted by providers based in the county. Each county name links to its page, with the permitting authority and how the maintenance report is filed there.

Method and limits

• Providers and technicians are current OSSF Maintenance Provider licenses and Maintenance Technician registrations in the TCEQ license register, as read on Oct 5, 2026.
• Each is counted once, in the county of the licensee’s mailing address. That is where a provider is based, not where it works. Seven provider licenses and three technician registrations with a blank county or an out-of-state address are left out.
• A license is a person, not a company. A company with three licensed providers counts three times.
• Aerobic permits are surface (spray) plus drip Authorizations to Construct from the eleven TCEQ “Types of Systems Installed” reports, 2015–2025. Systems a TCEQ regional office permits directly are reported by region, not by county, so they are not in these counts. That affects large regions too: in 2024 alone TCEQ reported 1,118 such authorizations statewide, 348 of them in Region 10 (Beaumont) and 272 in Region 04 (DFW Metroplex), all system types. Permits per provider therefore understates the true figure wherever a regional office permits directly.
• Everything here is recomputed from the per-county rows in the CSV, which anyone can check.

How we research and check our data. Not legal advice.

How to cite this page

DulyTrack, “Where Texas aerobic maintenance providers are based,” Oct 14, 2026, https://dulytrack.com/data/texas-maintenance-providers-by-county. Data: TCEQ OSSF license register and “Types of Systems Installed” reports, 2015–2025. CC BY 4.0.

Free to reuse with attribution under CC BY 4.0.

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