Purissima Hills Water District

26375 Fremont Road

Los Altos Hills, California  94022-2699

Phone: (650) 948-1217                               Fax: (650) 948-0961

 

Service Area

 

The Purissima Hills Water District provides service to two-thirds of the Town of Los Altos Hills, a rural community adjacent to the City of Palo Alto, and unincorporated county land on the southern boundary. The District serves predominantly single-family homes on minimum one-acre lots. The largest customer is Foothill College.

 

System

 

Profile

 

Area Size

4,600 acres

Service Population

 6,150

Number of Accounts

2,201

Number of SF RWS Connections

2

Connections To SF RWS Mains

BDPL 3 and 4

Avg. Day Demand (mgd)

1.31

Avg. Day Purchases From SF RWS (mgd)

1.31

%  Demand Met With SF RWS Supplies

100.0%

Maximum Local Water Production (mgd)

0

Alternative Supply Sources

None

Interties With Other Agencies

CWS - Los Altos, City of Palo Alto

Local Storage (mg)

9.88

Days of Storage

All 4 distribution zones can meet the 8 hr criteria either separately or by pumping from zones with excess capacity

 

Summary

 

Purissima Hills Water District receives 100% of its water supply from two San Francisco/Hetch Hetchy turnouts located along the Foothill Expressway on the northern edge of the District. The SF RWS supply is gravity-fed through 18" transmission mains to the Deer Creek Pump Station and McCann Tanks at 250 feet above sea level.

 

All services within the District are gravity fed from tanks in the respective zones. The distribution system consists of 4 pressure zones, 11 tanks, 5 pumping stations, 15 pumps, and 80 miles of pipe.

 

Water Supply and Demand

 

Supply by Source

Actual
FY 13-14
(ccf)

Actual
FY 14-15
(ccf)

Actual
FY 15-16
(ccf)

Actual
FY 16-17
(ccf)

San Francisco Water

982,100

803,313

640,369

689,261

Recycled Water

0

0

0

0

Other

0

0

0

0

Total

982,100

803,313

640,369

689,261

Mgd equivalent

2.01

1.65

1.31

1.41

 

 

 

 

 

Demand by Sector

 

 

 

 

Residential

885,184

732,811

591,604

627,686

Commercial/Industrial

0

0

0

0

Other

59,871

44,713

24,255

37,137

Dedicated Irrigation

5,339

4,305

5,061

0

Unaccounted for

31,706

21,484

19,449

24,438

Total

982,100

803,313

640,369

689,261

Mgd equivalent

2.01

1.65

1.31

1.41

 

 

 

 

 

Per Capita Use

Actual
FY 13-14
(gpcpd)

Actual
FY 14-15
(gpcpd)

Actual
FY 15-16
(gpcpd)

Actual
FY 16-17
(gpcpd)

Residential

295

245

197

209

Gross

328

268

213

230

 

Facilities and Distribution

 

Storage Reservoirs

 

Designation

Type

Capacity
(gallons)

 

Designation

Type

Capacity
(gallons)

MC Tank 1

Steel

130,000

 

A Tank 1

Redwood

200,000

MC Tank 2

Steel

1,000,000

 

A Tank 2

Cor-ten Steel

250,000

LC Tank 1

Steel

100,000

 

N Tank 1

Cor-ten Steel

200,000

LC Tank 2

Cor-ten Steel

900,000

 

N Tank 2

Cor-ten Steel

3,000,000

HH Tank

Concrete

3,100,000

 

PM Tank

Cor-ten Steel

500,000

E Tank

Steel

500,000

 

Total

 

9,880,000

 

 

 

 

 

 

 

 

 

Interties

 

Name

No.

Diameter
(in.)

CWS - Los Altos

2

8, 12

City of Palo Alto

2

12, 12