California Water Service - Mid-Peninsula District

341 North Delaware Street

San Mateo, California  94401-1727

Phone: (650) 558-7800                               Fax: (650) 342-6865

Web: calwater.com

 

Service Area

 

California Water Service’s Mid-Peninsula District is located in central San Mateo County and serves the communities of San Carlos, San Mateo, parts of unincorporated Redwood City, and adjacent unincorporated portions of San Mateo County, including The Highlands and Palomar Park.

 

System

 

Profile

Area Size

17 square miles

Service Population

137,693

Number of Accounts

35,930

Number of SF RWS Connections

8

Connections To SF RWS Mains

Bay Crossing 1and 2, BDPL 1 and 2, Crystal Springs #2, Sunset Pipeline

Avg. Day Demand (mgd)

11.82

Avg. Day Purchases From SF RWS (mgd)

11.82

%  Demand Met With SF RWS Supplies

100%

Maximum Local Water Production (mgd)

0

Alternative Supply Sources

None

Interties With Other Agencies

Mid-Peninsula WD, Redwood City, Belmont, Burlingame, Hillsborough, and Estero MID

Local Storage (mg)

19.9

Days of Storage

1.44 - All zones can meet the 8 hr criteria either separately or by pumping from zones with excess capacity.

 

Summary

 

The Mid-Peninsula District receives all of its water from the SF RWS. Water is delivered to the San Carlos area via 3 SF RWS turnouts located off BDPL 1 and 2. San Mateo is supplied from 5 turnouts located off the Crystal Springs Pipeline #2 and Sunset Supply Lines. The distribution system includes 22 pressure zones in San Carlos, 18 in San Mateo, 62 booster pumps, 38 storage tanks, 2,832 hydrants, and 363 miles of main.

 

Water Supply and Demand

 

Supply by Source

Actual
FY 20-21
(ccf)

Actual
FY 21-22
(ccf)

Actual
FY 22-23
(ccf)

Actual
FY 23-24
(ccf)

San Francisco Water

6,336,593

6,074,256

5,525,097

5,766,969

Local Groundwater

0

0

0

0

Surface Water

0

0

0

0

Recycled Water

0

0

0

0

Other

0

0

0

0

Total

6,336,593

6,074,256

5,525,097

5,766,969

mgd equivalent

12.99

12.45

11.32

11.82

 

 

 

 

 

Demand by Sector

 

 

 

 

Residential

4,490,547

4,075,560

3,684,229

3,799,873

Commercial/Industrial

1,063,339

1,057,248

1,015,289

1,066,171

Other

345,231

337,275

334,645

351,992

Unaccounted for

237,164

604,256

490,940

548,933

Total

6,336,593

6,074,256

5,525,097

5,766,969

mgd equivalent

12.99

12.45

11.32

11.82

 

 

 

 

 

Per Capita Use

Actual
FY 20-21
(gpcpd)

Actual
FY 21-22
(gpcpd)

Actual
FY 22-23
(gpcpd)

Actual
FY 23-24
(gpcpd)

Residential

67

61

55

57

Gross

94

91

82

86

 

Facilities and Distribution

 

Storage Reservoirs

 

Designation

Type

Capacity (gallons)

 

Designation

Type

Capacity (gallons)

San Mateo

 

 

 

San Mateo

 

 

Sta. 006-Tank 1

Brick

1,525,000

 

Sta. 025-Tank 2

Steel

250,000

Sta. 006-Tank 2

Brick

1,525,000

 

Sta. 025-Tank 3

Steel

250,000

Sta. 017-Tank 1

Steel

500,000

 

Sta. 027-Tank 1

Steel

2,500,000

Sta. 017-Tank 2

Steel

500,000

 

Sta. 027-Tank 2

Steel

2,500,000

Sta. 017-Tank 3

Steel

500,000

 

Sta. 027-Tank 3

Conrete

3,860,000

Sta. 023-Tank 1

Steel

1,000,000

 

Sta. 029-Tank 1

Steel

1,000,000

Sta. 024-Tank 1

Steel

500,000

 

Sta. 030-Tank 1

Steel

500,000

Sta. 024-Tank 2

Steel

500,000

 

Sta. 031-Tank 1

Steel

220,000

Sta. 025-Tank 1

Fiberglass-Lined Redwood

100,000

 

Sta. 032-Tank 1

Steel

250,000

Sta. 032-Tank 1

Steel

500,000

 

Sta. 033-Tank 1

Steel

500,000

Sta. 033-Tank 1

Steel

300,000

 

 

 

 

Total          

19,280,000

 

Storage Reservoirs

 

Designation

Type

Capacity (gallons)

 

Designation

Type

Capacity (gallons)

San Carlos

 

 

 

San Carlos

 

 

 Sta. 106-Tank 2

Steel

250,000

 

Sta. 118-Tank 1

Steel

200,000

Sta. 106-Tank 3

Steel

500,000

 

Sta. 118-Tank 2

Steel

750,000

Sta. 109-Tank 2

Steel

250,000

 

Sta. 119-Tank 1

Steel

400,000

Sta. 112-Tank 1

Steel

200,000

 

Sta. 120-Tank 1

Steel

500,000

Sta. 112-Tank 2

Steel

500,000

 

Sta. 120-Tank 2

Concrete

400,000

Sta. 112-Tank 3

Steel

700,000

 

Sta. 122-Tank 3

Steel

20,000

Sta. 115-Tank 1

Steel

250,000

 

Sta. 123-Tank 3

Steel

250,000

Sta. 116-Tank 2

Fiberglass- Lined Redwood

100,000

 

Sta. 123-Tank 4

Steel

425,000

Sta. 116-Tank 3

Fiberglass- Lined Redwood

100,000

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

San Carlos Total

 

 

 

 

 

6,490,000

San Mateo and San Carlos Total

 

25,770,000

 

Interties

 

Name

No.

Diameter (in.)

 

Name

No.

Diameter (in.)

San Carlos

 

 

 

San Mateo

 

 

  Redwood City

3

8, 8, 12

 

  Burlingame

3

4, 4, 6

  Mid-Peninsula WD

3

8, 8, 8

 

  Hillsborough WD

2

6, 6, 6

 

 

 

 

  Mid-Peninsula WD

2

6, 6, 6

 

 

 

 

  Estero MID

1

12