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Orange County Sanitation District (OCSD)

The Orange County Sanitation District (OCSD) has been serving over 2.1 million people since its inception, with early trunk sewers built in 1912. Covering over 470 square miles, OCSD operates 825 miles of trunk lines and two wastewater treatment plants. Plant 1 was established in the 1920s and features advanced reclamation systems, while Plant 2, constructed in 1954, discharges effluent five miles offshore into the Pacific Ocean. Recognized as a Historic Civil Engineering Landmark, OCSD’s sewage treatment and disposal systems are among the most modern in the U.S.

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Orange County Sanitation District (OCSD)

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  1. Orange County Sanitation District (OCSD)

  2. Orange County Sanitation District • Early trunk sewers were built in Orange County as early as 1912. • Over 2.1 million people served. • Over 470 square miles. • 825 miles of trunk lines • Two treatment plants • 270 million gallons of wastewater per day

  3. Plant 1 - Facilities of the County Sanitation Districts of Orange County

  4. Orange County Sanitation District • In 1920’s first ocean outfall and screening plant at the present location of Plant 1 were constructed. • 1950 wastewater reclamation system was built and effluent from primary treatment at Plant 1 was discharged to bean fields for irrigation. • 1954 Plant 2 was constructed located near the ocean and adjoining the Santa Ana River. Second ocean outfall was constructed.

  5. Plant 2 - Facilities of the County Sanitation Districts of Orange County

  6. Orange County Sanitation District • Most of the effluent is discharged five miles into the Pacific Ocean in 190 feet of water. • Plant 1 and 2 currently have activated sludge treatment, digester and sludge processing, and trunk sewer lines. • The system of sewage collection, treatment, and disposal is considered one of the most modern and advanced in the nation.

  7. Orange County Sanitation District • The Orange County Sanitation District was designated as an Orange County Historical Civil Engineering Landmark.

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