California Water Service - Bear Gulch District
3525 Alameda De Las Pulgas
Menlo Park, California 94025
Phone: (650) 561-9709 Fax (650) 561-9723
Web: calwater.com
Service Area
The Bear Gulch District is located in southern San Mateo County, and serves the communities of Atherton, Portola Valley, Woodside, parts of Menlo Park, parts of unincorporated Redwood City, and adjacent unincorporated portions of San Mateo County including: West Menlo Park, Ladera, North Fair Oaks, and Menlo Oaks.
Cal Water acquired the Los Trancos County Water District in 2005, and acquired both Skyline County Water District and Woodside Mutual Water Company in 2009, incorporating them into the Bear Gulch District. These systems serve rural communities along Highway 35 between Page Mill Road and Highway 92.
In May 2024, Cal Water acquired the Kings Mountain Park Mutual Water Company (KMPWCO), a rural residential water company located in Woodside, California. This acquisition marked a significant transition for the community, which had been purchasing water from Cal Water for several years prior. Similarly, the Skylonda Mutual Water Company, a non-profit shareholder-owned water company serving 157 homes, became part of Cal Water's system in August 2023.
System
Note: Skyline system totals are included in the Profile and Summary numbers. Skyline’s portion of the total is shown in parentheses.
Profile
|
Area Size |
45.3 square miles |
|
Service Population |
61,431 |
|
Number of Accounts |
18,729 |
|
Number of SF RWS Connections |
8 |
|
Connections To SF RWS Mains |
BDPL 1 and 2, BDPL 3 and 4, Palo Alto Pipeline, (Bay Crossing 1 and 2) |
|
Avg. Day Demand (mgd) |
10.00 |
|
Avg. Day Purchases From SF RWS (mgd) |
10.00 |
|
% Demand Met With SF RWS Supplies |
100% |
|
Maximum Local Water Production (mgd) |
6.028 (BG Reservoir is offline due to seismic upgrades) |
|
Alternative Supply Sources |
Local Surface Water, Local Groundwater-(Skyline system only) |
|
Interties With Other Agencies |
Redwood City, Menlo Park, (None) |
|
Local Storage (mg) |
11.6 Treated, 215 Untreated |
|
Days of Storage |
0.92 - Length of storage based on loss of all sources of supply. All zones can meet the 8 hr criteria either separately or by pumping from zones with excess capacity. Could increase use of Bear Gulch reservoir in an emergency to meet partial demand. |
Summary
The Bear Gulch District receives 85% to 95% of its daily supply from the SF RWS, with the balance supplied by surface water runoff from California Water Service Company’s own watershed. The water is stored in the 215 million gallon Bear Gulch Reservoir, and treated at the 6 mgd Station 2 Filter Plant before distribution. The Skyline system is not hydraulically connected to the Bear Gulch system and receives 100% of its supply from the SF RWS. The Woodside Mutual system has been connected to the main Bear Gulch system for several years and has been served by Cal Water since this time.
The distribution systems consist of 57 pressure zones, 77 booster pumps, 35 storage tanks and reservoirs, 2,278 hydrants, and 289 miles of main. District water tanks provide storage for slightly more than 11 mg of potable water.
Water Supply and Demand
|
Supply by Source |
Actual |
Actual |
Actual |
Actual |
|
San Francisco Water |
5,836,065 |
5,114,178 |
4,618,546 |
4,878,606 |
|
Local Groundwater |
0 |
0 |
0 |
0 |
|
Surface Water |
0 |
113,504 |
0 |
0 |
|
Recycled Water |
0 |
0 |
0 |
0 |
|
Other |
0 |
0 |
0 |
0 |
|
Total |
5,836,065 |
5,227,682 |
4,618,546 |
4,878,606 |
|
mgd equivalen |
11.96 |
10.71 |
9.46 |
10.00 |
|
|
|
|
|
|
|
Demand by Sector |
|
|
|
|
|
Residential |
4,874,275 |
4,411,197 |
3,767,269 |
3,936,408 |
|
Commercial/Industrial |
454,253 |
477,764 |
435,577 |
461,584 |
|
Other |
142,077 |
144,171 |
129,827 |
125,604 |
|
Dedicated Irrigation |
11,195 |
13,694 |
10,482 |
12,628 |
|
Non-Revenue Water |
354,265 |
180,856 |
275,391 |
342,922 |
|
Total |
5,836,065 |
5,227,682 |
4,618,546 |
4,878,606 |
|
mgd equivalent |
11.96 |
10.71 |
9.46 |
10.00 |
|
|
|
|
|
|
|
Per Capita Use |
Actual |
Actual |
Actual |
Actual |
|
Residential |
164 |
148 |
127 |
132 |
|
Gross |
197 |
176 |
155 |
163 |
Facilities and Distribution
Storage Reservoirs
|
Designation |
Type |
Capacity (gallons) |
|
Designation |
Type |
Capacity (gallons) |
|---|---|---|---|---|---|---|
|
Bear Gulch Reservoir* |
Earth |
215,000,000 |
|
Sta. 028-Tank 1 |
Steel |
200,000 |
|
Sta. 002-Tank 1 |
Steel |
250,000 |
|
Sta. 029-Tank 1 |
Fiberglass-Lined Redwood |
100,000 |
|
Sta. 002-Tank 2 |
Steel |
500,000 |
|
Sta. 029-Tank 2 |
Fiberglass-Lined Redwood |
100,000 |
|
Sta. 005-Tank 6 |
Fiberglass-Lined Redwood |
100,000 (inactive) |
|
Sta. 029-Tank 3 |
Steel |
150,000 |
|
Sta. 005-Tank 8 |
Steel |
250,000 |
|
Sta. 030-Tank 1 |
Steel |
1,000,000 |
|
Sta. 005-Tank 9 |
Steel |
1,000,000 |
|
Sta. 031-Tank 2 |
Steel |
165,000 |
|
Sta. 006-Tank 1 |
Steel |
200,000 |
|
Sta. 032-Tank 1 |
Steel |
250,000 |
|
Sta. 007-Tank 5 |
Fiberglass-Lined Redwood |
100,000 |
|
Sta. 033-Tank 1 |
Steel |
10,000 |
|
Sta. 015-Tank 1 |
Fiberglass-Lined Redwood |
30,000 |
|
Sta. 034-Tank 1 |
Concrete |
75,000 |
|
Sta. 016-Res.1 |
Steel |
1,000,000 |
|
Sta. 036-Tank 1 |
Steel |
125,000 |
|
Sta. 017-Tank 1 |
Steel |
250,000 |
|
Sta. 037-Tank 1 |
Steel |
55,000 |
|
Sta. 019-Tank 1 |
Steel |
500,000 |
|
Sta. 038-Tank 1 |
Steel |
212,000 |
|
Sta. 019-Tank 2 |
Steel |
500,000 |
|
Sta. 039-Tank 1 |
Steel |
282,000 |
|
Sta. 021-Tank 1 |
Steel |
1,000,000 |
|
Sta. 041-Tank 1 |
Steel |
189,000 |
|
Sta. 021-Tank 2 |
Steel |
1,000,000 |
|
Sta. 041-Tank 2 |
Steel |
192,000 |
|
Sta. 022-Tank 1 |
Steel |
450,000 |
|
Sta. 042-Tank 1 |
Steel |
60,000 |
|
Sta. 025-Tank 1 |
Fiberglass-Lined Redwood |
100,000 |
|
Sta. 042-Tank 2 |
Steel |
60,000 |
|
Sta. 027-Tank 4 |
Steel |
750,000 |
|
Sta. 047-Tank 1 |
Steel |
80,376 |
|
|
|
|
|
Sta. 047-Tank 2 |
Steel |
80,376 |
|
Total |
|
|
|
|
226,177,752 |
|
|
* Reservoir storage capacity has been reduced by 6 feet in compliance with DSOD |
||||||
Surface Water Treatment Facilities
|
Designation |
Capacity |
|---|---|
|
Station 2 Filter Plant |
6 |
Interties
|
Name |
No. |
Diameter |
|
Redwood City |
2 |
6 |
|
Menlo Park |
3 |
6 |