Wastewater Discharge Permitting

Streamlined Wastewater Discharge Permitting to Meet Clean Water Act Requirements

The Clean Water Act (CWA) establishes strict permitting requirements for direct and indirect discharges of pollutants to “Waters of the U.S.” and state waters through the National Pollutant Discharge Elimination System (NPDES) program and related state regulations. We help facilities navigate these complex programs with end-to-end permitting and compliance support. With decades of experience, our experts help facilities obtain timely permits with achievable conditions while promoting operational flexibility.

Service Specifics

Our Wastewater Discharge Permitting Services

See how Trinity delivers comprehensive permitting and compliance services to protect water quality and keep your operations in full regulatory alignment.

We support NPDES permits for direct discharges, pre-treatment permits for indirect discharges, and land application, water reuse, and zero-discharge permits, including permit negotiation on conditions and limits.

Our team prepares and implements Stormwater Pollution Prevention Plans (SWPPPs) for construction and industrial activities, ensuring compliance with multi-sector and site-specific permits.

From permit application preparation and sampling programs to electronic discharge monitoring systems, Trinity ensures accurate, defensible compliance data and reporting.

We help client navigate Effluent Limitations Guidelines (ELGs) to properly characterize and permit their wastewater and stormwater discharges.

We execute permitting projects that include antidegradation analyses, Best Technology Available (BAT) reviews, variance requests, mixing zone analyses, reasonable potential analyses for permit limit development and pretreatment construction permitting.

Through our many state offices we help clients understand the local permitting requirements of industrial wastewater discharges to Publicly Owned Treatment Works (POTW) and municipal sanitary sewers.

Our state experts can help identify groundwater permits that are needed for specific land applications and onsite surface impoundments, such as evaporation ponds, detention basins or treatment lagoons.

Trinity can facilitate securing regulatory permits (Class I, II, or V) for wastewater discharges that may impact underground aquifers through U.S. EPA Regional offices or delegated state authorities.

SPCC Plans

Spill Prevention, Control, and Countermeasure (SPCC) plans ensure that facilities have in place containment and other controls that would prevent oil from reaching navigable waters and adjoining shorelines, and to contain discharges of oil should a spill occur.

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Wastewater Discharge Permitting FAQs

The NPDES program, authorized by the Clean Water Act, requires industrial facilities that discharge pollutants to U.S. waters to obtain permits. Separate programs exist for wastewater and stormwater discharges.

Trinity assists with NPDES wastewater permits, pre-treatment permits, land application and reuse permits, and stormwater permits for both construction and industrial activities. We also support zero-discharge permits where applicable.

Most industrial facilities need a water permit for either direct discharges or indirect discharges of stormwater and/or wastewater. Non-discharging facilities can even trigger certain permits (e.g., reuse permits, zero-discharge permits, etc.).

Direct discharges are released straight to a surface water (permitted under the NPDES program), whereas indirect discharges are sent to a Publicly Owned Treatment Work (POTW) first.

Effluent limits are based on either technology-based effluent limits (e.g., categorical or other TBELs) or water quality-based limits (using water quality criteria and stream designations).

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