State Board Issues Order Upholding Limits for Sac Regional Treatment Plant

The State Water Resources Control Board has issued a proposed order upholding stricter limits on discharges from the Sacramento Regional Wastewater Treatment Plant.

The proposed order followed a review of a strict new discharge permit for the plant, operated by the Sacramento Regional County Sanitation District, approved by the Central Valley Regional Water Quality Control Board in December 2010. The permit requires the district to limit the amount of ammonia and other constituents discharged into the Sacramento River and the Delta by the wastewater treatment plant.

In the proposed order issued Oct. 29, the State Board upholds most of the permit but amends the final effluent limitations for ammonia. It also upholds the permit’s final effluent limitation for nitrate, but for reasons other than those used by the regional board in its original order.

Studies have suggested that ammonia and other nutrients may be disrupting the food web in the environmentally troubled Delta, contributing to the decline in native fish populations such as Delta smelt.

Effluent from the treatment plant has been identified as the largest single source of ammonia in the Delta watershed.

The State Board is set to consider the proposed order Dec. 4. The order follows a previous draft issued in May and discussed by the State Board in July.

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A-2144ab Board Meeting Notification Letter and Draft Order (10-_2.pdf1.42 MB