Wastewater Treatment Facility Improvements

6 Documents in Project


SCH Number
Lead Agency
Mariposa Public Utilities District (Mariposa Public Utility District)
Document Title
Wastewater Treatment Facility Improvements
Document Type
MND - Mitigated Negative Declaration

Document Description
The existing Wastewater Treatment Facility (WWTF) was constructed in 1984. The WWTF consists of a head works structure including a communitor and partial flume flow monitoring, two oxidation ditches, two secondary clarifiers, flow proportional chlorine gas injection, chlorine contact tank and flow proportional sulfur dioxide feed for dechlorination. The facility provides secondary treatment, disinfection and dechlorination before discharge to Mariposa Creek.

Contact Information
Mark L. Rowney
Mariposa Public Utility District
4992 Seventh Street P.O. Box 494
Mariposa, CA 95338

(209) 966-2515


37°28'45"N 119°57'32"W
Cross Streets
Miller Road and State Highway 140
Total Acres
Parcel #
013-190-029 and 013-190-030
State Highways
Hwy 140
Mariposa Co. Unified
Mariposa Creek

Notice of Completion

Review Period Start
Review Period End
Development Type
Waste Treatment:Other (Tertiary MGD: 0.610)
Project Issues
Other Issues Cumulative Effects Landuse Water Supply Water Quality Vegetation Toxic/Hazardous Soil Erosion/Compaction/Grading Sewer Capacity Recreation/Parks Public Services Population/Housing Balance Noise Minerals Geologic/Seismic Forest Land/Fire Hazard Flood Plain/Flooding Drainage/Absorption Biological Resources Archaeologic-Historic Air Quality Aesthetic/Visual
Reviewing Agencies
Caltrans, District 10 Air Resources Board Cal Fire California Department of Parks and Recreation Department of Fish and Wildlife, Region 4 Department of Toxic Substances Control Department of Water Resources Native American Heritage Commission Regional Water Quality Control Bd., Region 5 (Fresno) Resources Agency State Water Resources Control Board, Division of Drinking Water State Water Resources Control Board, Divison of Financial Assistance
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