Wastewater Treatment Plants

The San Antonio River Authority (River Authority) began providing wastewater utility services in 1966. Today, the River Authority has five permitted active wastewater treatment plants. These plants utilize the latest technology to produce a high-quality effluent and to preserve the ecosystems into which the effluent is returned.

The costs of the wastewater treatment plants and service system, operations and maintenance, facilities expansions, and system administration are funded by connection fees, interest income on utilities funds, and uniform user rate charges.

Wastewater Treatment Plant

River Authority Wastewater Treatment Plants

The Upper Martinez plant services approximately 11,200 customers. The Upper Martinez plant began operation in 1967 with an average daily flow of 1.55 MGD and a permitted flow of 2.21 MGD.

Wastewater Treatment Plant

The Martinez II Wastewater Treatment plant services approximately 8,400 customers. Martinez II began operations in 1986 with an average daily flow of 2.12 MGD and a permitted flow of 3.5 MGD.

Wastewater Treatment Plant

The Martinez IV Wastewater Treatment Plant services development in Eastern Bexar County approximately serving 6,700 customers. Martinez IV began operations in April 2019 with a permitted flow of 0.25 MGD. An expansion of this treatment plant in 2023 increased the permitted flow to 2.0 MGD.

Location of Customers Served

The Martinez IV Wastewater Treatment plant services development in The Parc at Escondido, Notting Hill, Notting Hill Manor, Summer Hill, Reserve at Schertz, Paloma, Heathers Place and Asher Place Subdivision located in eastern Bexar County.

Martinez IV received a silver Envision rating from the Institution of Sustainable Infrastructure.

Martinez IV Wastewater Treatment Plant
Martinez IV Wastewater Treatment Process

The First Responders Academy (FRA) Wastewater Treatment Plant services the Alamo Community College district and the First Responders Academy. The FRA plant began operations in 2013 with an average daily flow of 0.003 MGD and a permitted flow of 0.025 MGD.

Wastewater Treatment Plant

The Salitrillo Wastewater Treatment Plant (WWTP) services approximately 18,000 connections. The Salitrillo plant began operations in 1966 with an average daily flow of 3.96 MGD and a permitted flow of 5.83 MGD. In order to meet the growing population in the area, the Salitrillo WWTP recently completed an expansion bringing the total capacity to 7.33 MGD. 

Wastewater Treatment Plant

Tips for Keeping Your Pipes Clean

Tip #1

Trash the Wipes

No Wipes in the Pipes! Proper disposal of wipes keeps our wastewater systems working smoothly, protects the infrastructure and keeps our creeks and rivers free of contaminants.

Place the following in the trash after use: 

Tip #2

NO Fats, Oils & Grease (F.O.G.)

Pouring and washing fats, oils and grease down the drain causes grease build-up in the pipes leading to major damage and restricts the flow of wastewater from homes, businesses and along wastewater lines resulting in increased costs to residents and business owners and contamination to area creeks and rivers.

Heavy foods that should not go down the drain:

Alerts

Park Closure Notice: Trueheart Ranch

Unfortunately, Trueheart Ranch Nature Park (14984 Blue Wing Rd, San Antonio, TX 78221) is closed until further notice due to recent vandalism. We’re working to assess and repair the damage to ensure the park is safe and welcoming for everyone. Thank you for your understanding—updates will be shared as soon as we have them.

Trail Closure – San Pedro Creek Culture Park

* Trail temporarily closed from 5/1/2025 until 9/1/2025. Due to adjacent construction work, the San Pedro Creek Trail on the west side of the creek will be closed from the access point at W. Nueva Street to Dolorosa Street until further notice. Alternate route with ADA access is on the east side of the creekSan Pedro Creek Culture Park Trail Closure

Trail Closure: Museum Reach at Pearl

* Trail temporarily closed from 2/3/2025 until 5/16/2025. * For southbound pedestrian traffic, please exit the river and utilize the Hotel Emma bridge to gain access to the east side river trail. Access to the east side river trail via the elevator or stairs. * For northbound pedestrian traffic, please exit the river trail at the south bridge to gain access to the east side river trail. Continue north through Pearl towards Hotel Emma. The west & east side river trail accessible via the Hotel Emma bridge. North Bridge West Landing & Stairs Trail Closure Map  

Graytown Park Parking Lot Construction Notice 

Construction Timeline: April – October 2024 (estimated) Improvements are coming to Graytown Park! Parking lot construction will begin in April, and we appreciate your patience as we work to enhance the park for all visitors. Temporary Closures & Impacts:
  • Upper parking area, pavilion, and restrooms will be CLOSED during construction. Temporary restroom facilities will be provided.
  • Park and river access will be CLOSED Monday–Friday from 8 AM – 5 PM (no access during these hours).
We encourage visitors to plan accordingly and check back for updates as the project progresses. Thank you for your support! Stay Updated: Follow us on social media for the latest updates.

Goliad Paddling Trail Alert

NOTICE: HWY 59 Landing Site Closed Due to TxDOT construction on the HWY 59 Bridge, the HWY 59 landing site is closed until further notice. However, the Goliad Paddling Trail remains open, and paddlers can still access the river at the Riverdale, Ferry Street, and Goliad State Park landings. Please plan accordingly and check back for updates.

SASPAMCO Paddling Trail Temporarily Closed

Staff have removed two large log jams just downstream of Helton Nature Park, keeping the southern portion of the SASPAMCO Paddling Trail temporarily closed. Staff are working to contact adjacent landowners to support a land-based removal solution.

SASPAMCO Paddling Trail

The SASPAMCO paddling trail is open from River Crossing Park to Helton Nature Park. *Please Note: Paddling Trail from Helton Nature Park to HWY 97 is still closed due to blockages. 

River Reach Newsletter and Blog Signup

River Reach is offered as a printed, physical mailing to your residence or business. The Blog is a weekly electronic email with news and updates in order to be more environmentally conscious. Please fill out the form below and indicate your preferred method of delivery.

By submitting this form, you are consenting to receive marketing materials from: San Antonio River Authority, 100 East Guenther St., San Antonio, TX, 78204, US. You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact. This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.