Hydrostatic Test Water Discharges: Am I Regulated?

Find out if your facility needs coverage under the Hydrostatic Test Water general permit (TXG670000) or an individual permit to discharge wastewater.

TCEQ reissued the Hydrostatic Test Water General Permit No. TXG670000, with an effective date of April 5, 2025. Existing permittees must submit an NOI under the reissued permit within 90 days of the effective date to maintain coverage.

Facilities Likely to be Regulated

This general permit regulates the discharge of wastewater resulting from the hydrostatic testing of vessels (pipelines, tanks, and other containers) into or adjacent to water in the state .

You may be eligible for coverage under this general permit if you plan to discharge of water resulting from a hydrostatic test of a vessel into or adjacent to water in the state from:

New vessels;
Existing vessels that contain or previously contained or transferred raw or potable water, where the water used for hydrostatic tests does not contain corrosion inhibitors, antifreeze compounds, biocides, or other chemical additives (except chlorine or tracer dyes);
Existing vessels that previously contained only elemental gases (hydrogen, oxygen, nitrogen, etc.); and
Existing vessels that previously contained petroleum product or waste related to petroleum products.

See if you qualify for this general permit at Obtaining Coverage Under the General Permit for Discharges of Hydrostatic Test Water

Next Step

If you think-after reading the general permit-that it might be appropriate for your facility, continue to Obtaining Coverage under the Hydrostatic Test Water General Permit TXG670000.

If you don't qualify for coverage under this general permit, you may require an individual permit for any discharges released.