Recycled water quality

Water from the East Bayshore and San Ramon Valley recycled water projects is safe for all approved tertiary-treated uses.

Below is a comparison of water quality averages in 2015. EBMUD drinking water averages are provided for comparison. For more information on drinking water quality, see our Annual Water Quality ReportAbbreviations are defined below

Constituent


Unit


EBMUD
drinking water
EBRWP
recycled water
[note 1]
SRVRWP
recycled water
[note 1]
Aluminum mg/L < 0.05 < 0.05 --
Ammonia mg/L -- [note 2] 50 31.2
Boron mg/L < 0.1 0.3 0.56
Calcium mg/L 5 - 34 [note 3] 32.7 49
Chloride mg/L 11 382.5  240
Chloramine Residual
(as Chlorine)
mg/L 2 2.69 --
Color units < 1 37.75 --
Conductivity mmhos/cm 0.174 2.02 1.55
Fluoride mg/L 0.6 - 1.2[note 4] 1.07 --
Hardness mg/L 14 - 140[note 3] 184.17  243
Iron mg/L 0.001 0.19 --
Magnesium mg/L 1 - 14[note 3] 23.54 29
Manganese mg/L 0.001 0.11 0.04
Nitrate (as Nitrogen) mg/L < 0.04 0.39

0.23

Orthophosphate
(as Phosphorus)
mg/L 0.001 3.48 --
pH 0 - 14 scale 8.3 - 9.4[note 3] 7.29 7.32
Potassium mg/L 1 - 2[note 3] 33.78 18.5
Silica mg/L 6 - 15[note 3] 6.84 16
Sodium mg/L 6 - 33[note 3] 258.5 179
Sulfate mg/L 15 65.75 87.3
TDS (Total Dissolved Solids) mg/L 115 992.5 724
Turbidity NTU 0.03 0.21 MF = 0.11; SF = 1.48
Zinc mg/L 0.002 0.051  --
Copper mg/L 0.002 0.008  --
Lead mg/L  0.0003 0.004  --

Notes 

Note 1
Water quality meets California Department of Public Health Title 22 criteria for tertiary-treated recycled water, using either microfiltration (MF) or sand filtration (SF) methods as well as chlorine and/or ultraviolet light disinfection.
Note 2
There is no drinking water standard for this constituent. The constituent is measured and reported for recycled water.
Note 3
Range of samples.
Note 4
In 2015 state regulations required that fluoride levels in the treated water be maintained between 0.6 to 1.2 mg/l with an optimum dose of 0.7 mg/l.

Abbreviations

EBRWP: East Bayshore Recycled Water Project (EBMUD project)
SRVRWP: San Ramon Valley Recycled Water Program, a joint project of the Dublin San Ramon Services District & EBMUD
mg/L: Milligrams per liter, or parts per million
mg/L: Micrograms per liter, or parts per billion
mL: Milliliter, or 0.001 liter; 100 ml = 0.1 liter (1/10)
mmhos/cm: Millimhos per centimeter (equivalent to decisiemens per meter [dS/m], the international unit for electrical conductivity)
MRDLG: Maximum residual disinfectant level goal
NTU: Nephelometric Turbidity Unit
MF: Microfiltration
SF: Sand filtration
UV: Ultraviolet light disinfection