Certain industrial and commercial facilities are required to obtain Industrial Pretreatment Permits for their routine wastewater discharges. However, facilities that do not need a full discharge permit but occasionally generate non-routine, non-domestic discharges may instead need a Temporary Discharge Authorization (TDA).
Examples of discharges that may require a TDA include, but are not limited to:
- Hydrostatic testing
- Chemical cleaning, including tank cleanouts
- Maintenance or system flushing
- Cooling tower or system flushing
- Pipe and tank passivation discharges
- Containment or stormwater discharges that may contain chemical contamination
UOSA requires any facility planning to conduct these types of discharges to complete a Temporary Discharge Application (TDA) for documentation and approval purposes.
UOSA’s review process may take 10–12 days to evaluate potential impacts on UOSA’s operations, infrastructure, and personnel. As part of the review, additional requirements—such as sampling—may be imposed. Please note that any modifications to an approved application will require a new approval.
A new TDA must be submitted for each separate discharge event. Sanitary (domestic) wastewater discharges are exempt from this requirement.
You can access a blank TDA form by selecting the tab labeled “Temporary Discharge Application Form” on the right.
For further guidance and regulatory information related to Industrial Pretreatment Programs, please refer to the applicable jurisdictional sewer ordinances. Links to the four jurisdictional ordinances are available under the “Ordinances” section on the right.
Temporary Discharge Application Form
Ordinances
Prince William County
City of Manassas
City of Manassas Park
Fairfax County
Ready to Submit?
Email your completed TDA form to RegulatoryAffairs@uosa.org
Mailing Address
Upper Occoquan Service Authority
14631 Compton Rd, Centreville, VA 20121
Phone (703) 830-2200 Ext. 1295
Fax (703) 968-7443
RegulatoryAffairs@uosa.org
Contact Us
Email: RegulatoryAffairs@uosa.org
Phone: (703) 830-2200
Ext: x1295 or x1202