East Rio Hondo Water Supply Corporation (ERHWSC)
ERHWSC is located in Cameron County, Texas, approximately 6 miles away from the U.S./Mexico border. The Corporation was created in the 1970's to provide potable water service to the rural areas of Cameron County north of SH 100, east of US Highway 77/83, south of the Cameron/Willacy County line and the flood way, and east to the Laguna Madre, excluding the areas of Harlingen, Los Fresnos, San Benito, Combes, Rio Hondo and Laguna Madre Water District. ERHWSC provides potable water to an unincorporated area totaling approximately 24,000 people. Authority for water service is issued by Texas Commission on Environmental Quality (TCEQ) through Certificate of Convenience and Necessity (CCN) No. 11552. The system covers approximately 407 square miles and has approximately 7,250 retail water meters and an additional 500 meters served through three wholesale accounts.
ERHWSC has a wastewater treatment plant and collection system for the colonias of Lozano and Las Yescas and is authorized to provide wastewater (sewer) service under CCN No. 20861. Phase 1 of the wastewater improvements was funded by the United Stated Department of Agriculture-Rural Development. ERHWSC plans a second phase which will expand the phase 1 WWTP and collection system and will provide wastewater service for residents in the colonias of Arroyo Gardens, Lantana, Arroyo Colorado Estates, and San Vicente.
On September 5, 2003, Arroyo Water Supply Corporation's (AWSC) board approved Resolution No. 0201 agreeing to a merger with ERHWSC. ERHWSC concurred with the merger by passing a Resolution on September 9, 2003. On October 12, 2003, AWSC held a membership referendum concerning the merger with ERHWSC and the referendum passed by 2/3rd vote. Articles of the Merger between AWSC and ERHWSC were signed in December 2003 and the merger took effect on January 1, 2004.
The ERHWSC operates 3 surface water treatment plants (WTP), one in Arroyo City, 0.675 Million Gallons Day (MGD), 2 near San Benito (3.2 MGD) & (8.0 MGD) and a brackish ground water Reverse Osmosis water treatment plant ( 2.0 MGD) west of Combes, Texas. ERHWSC operates its water treatment plants under TCEQ ID No. 000310096, 000310031 and 000310094.
ERHWSC supplements their water supply by purchasing potable water from the City of Harlingen Waterworks System through an existing interconnect, located just northwest of the Harlingen Airport. ERHWSC and the City of Harlingen have a contractual agreement that expires in February 2019, for the purchase of 6.0 million gallons per month (200,000 GPD) of treated potable water.
ERHWSC is currently designing or constructing transmission lines to connect the system with trunk lines from the east to the west end. ERHWSC's Board and management team diligently strive to maintain quality service and high quality water for our members at a reasonable price.