Modern Engineering Solutions

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River Valley Wastewater Treatment Plant – Martindale, TX (Ongoing)

Project Challenge Overcome: 

Discharge permits in Caldwell County near the San Marcos River watershed face intense scrutiny from regional water authorities and environmental advocacy groups. Public hearings attended by Modern Engineering Solutions staff for neighboring discharge permit applications revealed highly contentious 30+ month permitting timelines. The 210E pathway bypassed this opposition entirely, securing approval in just 4 weeks by demonstrating beneficial agricultural reuse. The project’s 2.0 MGD scale, one of the largest 210E authorizations issued to date for MES, proves that flow volume does not limit 210E applicability when industrial components and viable reuse plans are present. The off-site reuse agreement with Circle G Livestock provides long-term disposal certainty while supporting local agricultural operations.

Location: Martindale, Caldwell County, Texas
Authorization Number: 2E-0000348
Time to Permit: 4 weeks
Time Saved vs. Discharge Permit: ~23 months
Project Type: Master-planned mixed-use development combining residential subdivisions, data center operations, and concrete batch plant facilities

Wastewater Profile:

  • Design flow: 2,000,000 gallons per day (2.0 MGD)
  • Waste stream composition: Municipal wastewater: 1,794,000 gpd (89.7%), Data center wastewater: 120,000 gpd (6.0%), Concrete batch plant: 600 gpd (0.03%)


Reuse Strategy:

  • Off-site agricultural irrigation to Circle G Livestock tree farm and sod production
  • 53 acre-foot storage reservoir designed per 30 TAC §309.20 using 25-year worst-case precipitation data