Alameda County Water District

43885 South Grimmer Boulevard

Fremont, California  94538-6348

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

Web: http://www.acwd.org

 

Service Area

Alameda County Water District (ACWD) supplies water to the cities of Fremont, Newark, and Union City.

 

System

 

Profile

Area Size

104.8 sq. miles

Service Population

 344,000

Number of Accounts

83,007

Number of SF RWS Connections

8

Connections To SF RWS Mains

BDPL 1, 2, 3, 4 and 5

Avg. Day Demand (mgd)

34.33

Avg. Day Purchases From SF RWS (mgd)

 7.73

%  Demand Met With SF RWS Supplies

22.5%

Maximum Local Water Production (mgd)

65.852 (7/16/10, Production facilities + direct SF RWS TOs + NUMMI)

Alternative Supply Sources

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

Interties With Other Agencies

Milpitas, Hayward

Local Storage (mg)

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

Days of Storage

1.8 - based on maximum capacity storage and average daily demand

42 mg of new treated water storage planned available by 2014

 

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 operates two surface water treatment plants that treat SWP 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 2000-2010 period, 36% 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 25% 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 39%) of the distribution system supplies.

 

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

4,052,940

4,371,390

5,684,760

 3,770,320

State Water Project

7,979,757

7,278,440

7,267,115

 6,304,438 

Desalinated Water

3,881,551

3,516,711

3,666,714

 3,554,812 

Local Groundwater

4,558,022

3,886,230

3,625,801

 2,591,578 

Surface Water

635,976

2,157,091

29,621

 530,561 

Recycled Water

0

0

0

0

Other

0

0

0

0

Total

21,108,246

21,209,862

20,274,011

16,751,709

mgd equivalent

43.26

43.47

 41.55 

34.31

 

 

 

 

 

 

Demand by Sector

 

 

 

 

Residential

12,774,687

13,656,723

13,250,738

10,337,623

Commercial/Industrial

2,770,570

3,265,490

3,282,861

2,983,057

Other

845,841

931,510

873,524

658,676

Dedicated Irrigation

2,742,603

2,506,906

2,354,869

1,590,737

Unaccounted for

1,974,545

849,233

512,019

1,181,616

Total

21,108,246

21,209,862

20,274,011

16,751,709

mgd equivalent

43.26

43.47

 41.55 

34.33

 

 

 

 

 

Per Capita Use

Actual
FY 10-11
(gpcpd)

Actual
FY 11-12
(gpcpd)

Actual
FY 12-13
(gpcpd)

Actual
FY 13-14
(gpcpd)

Residential

79

83

 80 

 62 

Gross

131

129

122

100

 

 

Storage Reservoirs

 

Designation

Capacity (gallons)

 

Designation

Capacity (gallons)

Alameda

16,250,000

 

Mayhew

4,450,000

Appian

780,000

 

Middlefield

7,230,000

Avalon

2,750,000

 

Ohlone

1,500,000

Canyon Heights

500,000

 

Patterson

14,400,000

Decoto

14,800,000

 

Vineyard Heights

500,000

Hidden Valley

2,000,000

 

Whitfield

20,000,000

 

37,080,000

 

Total

85,160,000

ACWD Engineering Report, 1995. (Mayhew and Canyon Heights updated to reflect changed conditions)


Water Treatment Facilities

 

Design ation

Capacity (mgd)

Status

 

Designation

Capacity (mgd)

Status

WTP #2

22

Active

 

Mission San Jose WTP

4

Active

Blending Facility

48

Active

 

Newark Desalination Facility

12.5

Active

 

70

 

 

Total

86.5

 

 

 

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

 

23.7

 

 

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