Westborough Water District

Updated: July 20, 2022

2263 Westborough Boulevard
South San Francisco, California 94080-5406

Phone: (650) 589-1435 Fax: (650) 589-5167

Service Area

The Westborough Water District is located within the City of South San Francisco in north San Mateo County. The District provides both water and sewer service, and has an agreement with the North San Mateo County Sanitation District for sewage disposal and facility maintenance.

System

Profile

Area Size	1 square mile
Service Population	13,466
Number of Accounts	3,885
Number of SF RWS Connections	1
Connections To SF RWS Mains	San Andreas 1, 2, and 3
Avg. Day Demand (mgd)	0.77
Avg. Day Purchases From SF RWS (mgd)	0.77
% Demand Met With SF RWS Supplies	100.0%
Maximum Local Water Production (mgd)	0
Alternative Supply Sources	None
Interties With Other Agencies	North Coast CWD, Daly City
Local Storage (mg)	6.5
Days of Storage	6.5 - All zones can meet the required 8 hr. coverage. During emergencies, District also has access to an additional 3.5 mg in storage owned by North Coast WD.

Summary

The Westborough Water District receives its entire water supply from the San Francisco Public Utilities Commission through a single 6” turnout located on Westborough Boulevard. This water is distributed to 3 Skyline storage tanks located at the north end of the district, from which the Skyline Pump Station pumps water to the Christen Hill Reservoir for gravity distribution to Zone 3, and the Main Water Pump Station pumps water to Zones 1 and 2.

The Christen Hill Reservoir is shared with the North Coast County Water District.

The WCWD distribution system includes 3 storage tanks, 2 pumping stations, 5 pumps, and 24 miles of mains. In addition to the Christen Hill Reservoir intertie with NCCWD, the district has an intertie with Daly City.

Water Supply and Demand

Supply by Source	Actual FY 17-18 (ccf)	Actual FY 18-19 (ccf)	Actual FY 19-20 (ccf)	Actual FY 20-21 (ccf)
San Francisco Water	383,996	379,833	400,616	373,994
Local Groundwater	0	0	0	0
Surface Water	0	0	0	0
Recycled Water	0	0	0	0
Other	0	0	0	0
Total	383,996	379,833	400,616	373,994
mgd equivalent	0.79	0.78	0.82	0.77

Demand by Sector
Residential	293,705	281,152	293,470	298,605
Commercial/Industrial	27,315	34,958	33,950	28,811
Other	0	0	0	0
Dedicated Irrigation	40,529	39,384	36,286	43,134
Non-Revenue Water	22,447	24,339	36,910	3,435
Total	383,996	379,833	400,616	373,994
mgd equivalent	0.79	0.78	0.82	0.77

Per Capita Use	Actual FY 17-18 (gpcpd)	Actual FY 18-19 (gpcpd)	Actual FY 19-20 (gpcpd)	Actual FY 20-21 (gpcpd)
Residential	47	45	47	45
Gross	62	57	65	57

Facilities and Distribution

Storage Reservoirs

Designation	Type	Capacity (mg)
SS Tank 1	Steel	1.5
SS Tank 2	Steel	2.5
SS Tank 3	Steel	2.0
CH Reservoir	Steel	0.5
Total		6.5

Interties

Name	No.	Diameter (in.)
North Coast	1	8
Daly City	1	12