Coastside County Water District
766 Main Street
Half Moon Bay, California 94019-1995
Phone: (650) 726-4405 Fax: (650) 726-5245
Web: 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 San Mateo Road, Moonridge, El Granada, Miramar, Pillar Point Harbor and Princeton.
System
Profile
|
Area Size |
14 square miles |
|
Service Population |
18,839 |
|
Number of Accounts |
7,658 |
|
Number of SF RWS Connections |
2 |
|
Connections To SF RWS Mains |
Upper Crystal Springs Intake and Pilarcitos Reservoir at Stone Dam |
|
Avg. Day Demand (mgd) |
1.58 |
|
Avg. Day Purchases From SF RWS (mgd) |
0.96 |
|
% Demand Met With SF RWS Supplies |
60.64% |
|
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 days |
Summary
Coastside County Water District has four water sources; (1) Pilarcitos Reservoir at Stone Dam, (2) Upper Crystal Springs Reservoir, (3) the Pilarcitos Creek Infiltration Well Field, and (4) the Denniston (groundwater and surface water) Project. Water purchased from the SF RWS is supplied from two different raw water sources: Pilarcitos Reservoir at Stone Dam and Upper Crystal Springs Reservoir.
Raw water from Upper Crystal Springs Reservoir, Pilarcitos Reservoir at Stone Dam and the Pilarcitos Creek Infiltration Wells terminate at the Nunes Water Treatment Plant. Raw water from Denniston Creek and the Denniston Well Field terminate at the Denniston Water Treatment Plant.
Water Supply and Demand
|
Supply by Source |
Actual |
Actual |
Actual |
Actual |
|
San Francisco Water |
547,861 |
496,627 |
705,680 |
468,075 |
|
Local Groundwater |
10,508 |
12,272 |
12,099 |
12,340 |
|
Surface Water |
314,412 |
382,259 |
168,436 |
291,430 |
|
Recycled Water |
0 |
0 |
0 |
0 |
|
Total |
872,781 |
891,158 |
886,215 |
771,845 |
|
mgd equivalent |
1.79 |
1.83 |
1.82 |
1.58 |
|
|
|
|
|
|
|
Demand by Sector |
|
|
|
|
|
Residential |
446,167 |
486,477 |
499,242 |
428,202 |
|
Commercial/Industrial |
48,065 |
46,340 |
41,741 |
40.365 |
|
Other |
266,457 |
255,259 |
163,455 |
184,481 |
|
Dedicated Irrigation |
41,335 |
48,645 |
144,202 |
100,379 |
|
Non-Revenue Water |
70,757 |
54,437 |
37,575 |
18,418 |
|
Total |
872,781 |
891,158 |
886,215 |
771,845 |
|
mgd equivalent |
1.79 |
1.83 |
1.82 |
1.58 |
|
|
|
|
|
|
|
Per Capita Use |
Actual |
Actual |
Actual |
Actual |
|
Residential |
54 |
53 |
54 |
47 |
|
Gross |
78 |
97 |
97 |
84 |
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 |
|
|
|
|
|
Total |
|
8.00 |
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 |
|
Inactive |
|
D3 |
37 |
Inactive |
|
D4 |
35 |
Inactive |
|
D5 |
35 |
Inactive |
|
D9 |
45 |
Active |
|
P1* |
40 |
November 1-March 31 |
|
P2* |
|
Inactive |
|
P3** |
|
Active |
|
P3A* |
|
Active |
|
P4* |
100 |
November 1-March 31 |
|
P4A* |
200 |
November 1-March 31 |
|
P5* |
65 |
November 1-March 31 |
|
Total |
|
635 |
*Surface water infiltration wells