Mid-Peninsula Water District

1075 Old Country Road, Suite A

Belmont, California  94002-0129

Phone: (650) 591-8941                               Fax: (650) 591-4998

Website

 

Service Area

 

The Mid-Peninsula Water District, located in central San Mateo County, serves the city of Belmont, portions of San Carlos, and unincorporated county areas. The predominant land use is residential.

 

System

 

Profile

 

Area Size

5 square miles

Service Population

30,609

Number of Accounts

8,195

Number of SF RWS Connections

2

Connections To SF RWS Mains

BDPL 1 and 2, Crystal Springs Bypass Tunnel

Avg. Day Demand (mgd)

2.27

Avg. Day Purchases From SF RWS (mgd)

2.27

%  Demand Met With SF RWS Supplies

100.0%

Maximum Local Water Production (mgd)

0

Alternative Supply Sources

None

Interties With Other Agencies

Estero MID, Redwood City, CWS - San Mateo, CWS - San Carlos

Local Storage (mg)

12.5

Days of Storage

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

 

Summary

 

The District’s sole source of potable water is delivered via two SF RWS turnouts. Local water storage is not feasible, and groundwater of adequate quantity and quality is not available.

 

The system contains 9 pressure zones. The easternmost zone, east of El Camino Real, is gravity fed from the SF RWS connection. Water is pumped to storage reservoirs at higher elevations to feed the remaining pressure zones. The District operates and maintains a complex distribution system that includes 20 pumps, 11 water tanks, 13 regulating valves, 813 hydrants, and 105 miles of water mains.

 

The District also has redundancy built into the entire distribution system, enabling either of the two SF RWS transmission mains to supply water to all customers of the District. The District has the ability to transfer water between pressure zones in either a pump-up or flow-down mode in emergency conditions.

 

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

1,273.998

1,172,923

1,055,377

1,107,642

Local Groundwater

0

0

0

0

Surface Water

0

0

0

0

Recycled Water

0

0

0

0

Other

0

0

0

0

Total

1,273.998

1,172,923

1,055,377

1,107,642

mgd equivalent

2.61

2.40

2.16

2.27

 

 

 

 

 

Demand by Sector

 

 

 

 

Residential

953,609

836,837

778,506

805,647

Commercial/Industrial

166,362

158,757

146,697

163,403

Other

34,506

33,109

31,950

30,498

Dedicated Irrigation

93,605

85,783

65,383

71,899

Non-Revenue Water

25,916

58,437

32,841

36,195

Total

1,273,998

1,172,923

1,055,377

1,107,642

mgd equivalent

2.61

2.40

2.16

2.27

 

 

 

 

 

Per Capita Use

Actual
FY 20-21
(gpcpd)

Actual
FY 21-22
(gpcpd)

Actual
FY 22-23
(gpcpd)

Actual
FY 23-24
(gpcpd)

Residential

71

58

53

54

Gross

95

95

72

74

 

Facilities and Distribution

Storage Reservoirs

 

Designation

Type

Capacity (mg)

 

Designation

Type

Capacity (mg)

Storage Tank 1

Steel

2.50

 

Storage Tank 7

Steel

0.79

Storage Tank 2

Steel

2.50

 

Storage Tank 8

Steel

0.79

Storage Tank 3

Steel

1.00

 

Storage Tank 9

Steel

0.10

Storage Tank 4

Steel

1.50

 

Storage Tank 10

Steel

0.10

Storage Tank 5

Steel

1.00

 

Storage Tank 11

Steel

1.50

Storage Tank 6

Steel

0.72

 

 

 

 

 

 

 

 

Total

 

12.50

 

Interties

 

Name

No.

Diameter
(in.)

 

Name

No.

Diameter
(in.)

Estero

1

12

 

CWS - San Carlos

2

8

Redwood City

1

12

 

CWS - San Mateo

3

8