On-Site Sewage Facilities (OSSF) are wastewater systems designed to treat and dispose of effluent on the same property that produces the wastewater. A septic tank and drainfield combination is the oldest and most common type of OSSF, although newer aerobic treatment units exist which represent scaled down versions of municipal sewage treatment plants. OSSFs account for approximately 25 percent of all domestic wastewater treatment in the United States. Tarrant County regulates the OSSF Inspection and Permit process for 23 cities and the unincorporated parts of the county. Follow this link for a list of Environmental Health Contract Cities.
In order to assure that wastewater is disposed safely, a permitting and inspection program requires that all OSSFs must be in substantial compliance with state regulations. Click here for a copy of the OSSF Rules and Regulations.
An OSSF permit is required for all new construction and anytime
renovations significantly change the structure’s square footage or
assigned water flow. Permits are also required if the type or
strength of the wastewater changes from a residential wastewater
classification. A repair/remodel permit is required anytime changes
are made to an existing system. The regulations require that an owner
must obtain a permit to repair, extended, modify or alter any of the
disposal system’s existing components. The required OSSF permit
application and resource documents are available for downloading at
either the Residential Permit Application Packet or the Nonresidential Permit Application Packet
It is very important to realize that nearly all of the unincorporated land in Tarrant County falls within the Extra Territorial Jurisdiction (ETJ) of existing cities. An ETJ is an area outside of a city’s limits where the city is allowed to require subdivision of acreage to meet minimum city requirements. Follow this link to the ETJ webpage for more information about these requirements.
There are several state requirements that must be met to properly subdivide acreage in the unincorporated areas of Tarrant County. State law requires that conditions be evaluated as to the suitability of the site if OSSFs are to be used. Follow this link to the Subdividing Land webpage for more information about these requirements.
Environmental Health staff has prepared a list of short answers for the most common OSSF inquires. Follow this link to the FAQ webpage for more information about the installation and maintenance of your OSSF.
County Telephone Operator 817-884-1111
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