Alameda County Water District

43885 South Grimmer Boulevard

Fremont, California  94538-6348

Phone: (510) 668-4200                               Fax: (510) 656-3426

Web: www.acwd.org

 

Service Area

The Alameda County Water District (ACWD) service area includes the cities of Fremont, Newark, Union City, and southern portions of the City of Hayward. Currently, ACWD provides retail water service predominantly within the Cities of Fremont, Newark, and Union City, and a small number of parcels outside of ACWD’s service area through agreements.

 

System

 

Profile

Area Size

104.8 sq. miles

Service Population

 358,246

Number of Accounts

87,859

Number of SF RWS Connections

8

Connections To SF RWS Mains

BDPL 1, 2, 3, 4 and 5

Avg. Day Demand (mgd)

39.90

Avg. Day Purchases From SF RWS (mgd)

 9.40

%  Demand Met With SF RWS Supplies

23.55%

Maximum Local Water Production (mgd)

86.5 mgd (Source: ACWD Engineering Report 2011, and includes WTP2, Blending Facility, Desal, and Direct Takeoffs from SFPUC)

Alternative Supply Sources

SF RWS, State Water Project (SWP), Local Groundwater

Interties With Other Agencies

Milpitas, Hayward

Local Storage (mg)

85.0 maximum capacity - volume in storage is typically 60 to 80% based on seasonal operating conditions

Days of Storage

1.7 - based on maximum capacity storage and average daily demand

 

Summary

 

ACWD currently has three primary sources of water supply: (1) the State Water Project (SWP), (2) San Francisco’s Regional Water System and (3) local supplies. The SWP and San Francisco Regional Water Supplies are imported into the District service area through the South Bay Aqueduct and Hetch-Hetchy Aqueduct, respectively. Local supplies include fresh groundwater from the Niles Cone Groundwater Basin (underlying the District service area), desalinated brackish groundwater from portions of the groundwater basin previously impacted by seawater intrusion, and surface water from the Del Valle Reservoir. The primary source of recharge for the Niles Cone Groundwater Basin is from percolation of runoff from the Alameda Creek watershed. To a lesser degree, a portion of ACWD’s SWP supplies are also used for local groundwater percolation. Infiltration of rainfall and applied water also contribute to local groundwater recharge.

Before being supplied to ACWD’s customers, the source water supplies are treated to meet and surpass all state and federal drinking water standards. ACWD is currently operating one surface water treatment plant that can treat SWP imports and local surface water from Del Valle Reservoir. The Newark Desalination Facility treats brackish groundwater to remove salts and other impurities, and the Blending Facility blends high quality San Francisco water with local fresh groundwater (with higher hardness) to provide a blended supply with lower overall hardness.

Over the FY 10/11 - 19/20 period, 37% of the District’s distribution system water supply was from the State Water Project. This water was either purified at one of ACWD’s two water treatment plants or used to recharge local aquifers. Water from the San Francisco Regional System provided approximately 21% of the distribution system water supply and local supplies from Del Valle Reservoir and groundwater (recharged from runoff from the Alameda Creek Watershed and infiltration of rainfall and applied water) accounted for the balance (about 42%) of the distribution system supplies.

 

Water Supply and Demand

 

Supply by Source

Actual
FY 17-18
(ccf)

Actual
FY 18-19
(ccf)

Actual
FY 19-20
(ccf)

Actual
FY 20-21
(ccf)

San Francisco Water

3,716,845

3,798,529

3,840,640

4,585,161

State Water Project

 6,675,349

 6,030,448

5,546,495

7,336,376

Desalinated Water

3,119,652

2,907,621

3,764,574

3,733,289

Local Groundwater

 3,647,727

3,347,726

3,427,942

3,583,690

Surface Water

 898,047

1,982,415

2,320,887

231,304

Recycled Water

0

0

0

0

Other

0

0

0

0

Total

18,057,620

18,066,739

18,900,527

19,469,820

mgd equivalent

37.01

37.02

38.73

39.90

 

Demand by Sector

 

 

 

 

Residential

10,708,680

10,500,526

11,131,726

11,654,792

Commercial/Industrial

3,152,692

3,067,959

3,013,144

3,055,890

Other

683,279

683,769

548,262

501,310

Dedicated Irrigation

2,018,205

1,909,035

2,358,131

2,478,129

Non-Revenue Water

1,494,764

1,905,450

1,849,275

1,779,699

Total

18,057,620

18,066,739

18,900,527

19,469,820

mgd equivalent

 37.01

37.02

38.73

39.90

 

 

 

 

 

Per Capita Use

Actual
FY 17-18
(gpcpd)

Actual
FY 18-19
(gpcpd)

Actual
FY 19-20
(gpcpd)

Actual
FY 20-21
(gpcpd)

Residential

62

60 64

67

Gross

104

92 108 111

 

 

Storage Reservoirs

 

Designation

Capacity (gallons)

 

Designation

Capacity (gallons)

Alameda

16,250,000

 

Mayhew

4,300,000

Appian

780,000

 

Middlefield

7,230,000

Avalon

2,750,000

 

Ohlone

1,500,000

Canyon Heights

510,000

 

Patterson

14,210,000

Decoto

14,550,000

 

Vineyard Heights

540,000

Hidden Valley

2,000,000

 

Whitfield

20,400,000

Total

84,970,000

 

 

 

ACWD Engineering Report, 2011.


Water Treatment Facilities

 

Design ation

Capacity (mgd)

Status

 

Designation

Capacity (mgd)

Status

WTP #2

22

Active

 

Mission San Jose WTP

3.2

Inactive

Blending Facility

48

Active

 

Newark Desalination Facility

12.5

Active

Total

70

 

 

 

85.7

 

 

 

Wells

 

Name

Capacity (mgd)

Status

 

Name

Capacity (mgd)

Status

Mowry 1

1.4

Active

 

PT 1

3.4

Active

Mowry 2

3.2

Active

 

PT 2

3.4

Active

Mowry 3

3.2

Active

 

PT 3

3.4

Active

Mowry 4

3.0

Active

 

PT 4

3.4

Active

Mowry 6

3.3

Active

 

PT 5

3.4

Active

Mowry 7

3.3

Active

 

PT 6

3.4

Active

Mowry 8

3.0

Active

 

PT 7

3.4

Active

Mowry 9

3.3

Active

 

PT 8

3.4

Inactive

Total

50.9

 

 

 

 

 

 

Interties

 

Name

No.

Diameter*
(in.)

Hayward

1

12

Hayward

2

**

Milpitas

1

8

Milpitas

2

8

**Diameter of main connected

**3.6 mgd connection to
**Hayward’s SF RWS Line