Coastside County Water District

766 Main Street

Half Moon Bay, California  94019-1995

Phone: (650) 726-4405                               Fax: (650) 726-5245

Web: http://www.coastsidewater.org

 

Service Area

 

Coastside County Water District provides water to the City of Half Moon Bay and several unincorporated coastal communities in San Mateo County, including El Granada, Miramar, and Princeton by the Sea (Pillar Point Harbor).

 

System

 

Profile

 

Area Size

14 square miles

Service Population

 16,652

Number of Accounts

7,938

Number of SF RWS Connections

2

Connections To SF RWS Mains

Crystal Springs Intake and Stone Dam (Pilarcitos Lake)

Avg. Day Demand (mgd)

1.80

Avg. Day Purchases From SF RWS (mgd)

1.49

%  Demand Met With SF RWS Supplies

82.9%

Maximum Local Water Production (mgd)

0.5

Alternative Supply Sources

During a drought, local production is extremely low due to dependency on surface stream flows and a small watershed.

Interties With Other Agencies

None

Local Storage (mg)

8.0

Days of Storage

Approximately 3.0 days

 

Summary

 

Coastside County Water District has four water sources: Pilarcitos Lake, Crystal Springs Reservoir, Pilarcitos Well Field, and the Denniston (well and surface water) Project. Water purchased from the SF RWS is supplied from two different sources: Pilarcitos Lake and Upper Crystal Springs Reservoir.

 

The Crystal Springs Water Supply Project, completed in 1994, consists of an intake tunnel under the reservoir, a pump station, and an eight-mile pipeline terminating at the Nunes Water Treatment Plant. Water is taken from Upper Crystal Springs Reservoir, when not available from Pilarcitos Lake or demand is greater than Pilarcitos Lake can supply. Deliveries taken from Upper Crystal Springs Reservoir and Pilarcitos Lake are limited by the capacity of the Nunes Treatment Plant, in addition to the design and capacity of the conveyance system.

 

The District maintains a distribution system that includes 7 pressure zones, 6 pump stations, 2 water treatment plants, 11 treated storage tanks, 637 hydrants, 10 miles of transmission (supply) pipeline, and 80 miles of distribution pipeline.

 

 

Water Supply and Demand

 

Supply by Source

Actual
FY 11-12
(ccf)

Actual
FY 12-13
(ccf)

Actual
FY 13-14
(ccf)

Actual
FY 14-15
(ccf)

San Francisco Water

832,099

885,895

940,214

727,298

Local Groundwater

0

896

2,674

6,297

Surface Water

64,532

109,586

54,372

143,984

Recycled Water

0

0

0

0

Total

896,631

996,377

997,260

877,579

mgd equivalent

1.84

2.04

2.04

1.80

 

 

 

 

 

Demand by Sector

 

 

 

 

Residential

534,063

554,030

552,572

475,491

Commercial/Industrial

219,616

211,793

136,934

136,816

Other

37,073

35,408

110,274

109,486

Dedicated Irrigation

61,515

111,778

122,219

96,101

Non-Revenue Water

44,364

83,368

75,260

59,685

Total

896,631

996,377

997,259

877,579

mgd equivalent

1.84

2.04

 2.04

1.80

 

 

 

 

 

Per Capita Use

Actual
FY 11-12
(gpcpd)

Actual
FY 12-13
(gpcpd)

Actual
FY 13-14
(gpcpd)

Actual
FY 14-15
(gpcpd)

Residential

64

67

68

58

Gross

107

121

123

108

 

Facilities and Distribution

Treated Water Storage Reservoirs

 

Designation

Type

Capacity (mg)

Denniston

Steel

1.50

El Granada 1

Steel

0.20

El Granada 2

Steel

0.15

El Granada 3

Steel

0.25

Miramar

Steel

1.00

Carter Hill

Steel

0.40

Carter Hill

Steel

0.60

Carter Hill

Steel

1.50

Miramontes

Steel

0.40

Alves

Steel

2.00

Hazen’s

Redwood

0.05

Total

 

8.05

 

Surface Water Treatment Facilities

 

Designation

Capacity (mgd)

Nunes WTP

4.5

Denniston WTP

1.0

Total

5.5

 

Wells

 

Name

Capacity (gpm)*

Status

D1

25

Active

D2

 

Standby

D3

37

Active

D4

35

Active

D5

35

Active

D9

45

Active

P1

40

November 1-March 31

P2

 

Standby

P3

 

Standby

P3A

 

Standby

P4

100

November 1-March 31
Standby

P4A

200

November 1-March 31

P5

65

November 1-March 31

Total

582

 

*Capacity is dependent on stream flows