Recycled Water Quality Data

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Recycled water used in Dublin and San Ramon meets all regulatory requirements for unrestricted reuse as well as guidelines for managing salts in the groundwater basin under the Tri-Valley.

The DSRSD laboratory tests the parameters listed in the table on a monthly basis to ensure recycled water used for irrigation will not harm landscaping, as well as to monitor salts returned to the watershed.

Recycled Water Quality Data, Calendar Year 2016

Constituent Unit Average Range
Alkalinity (as CaCO3) mg/L 300 250 - 350
pH standard unit 7.44 7.32 - 7.63
Conductivity µmhos/cm 1411 1137 - 1708
Total Dissolved Solids mg/L 700 578-770
Calcium mg/L 47

29 - 60

Magnesium mg/L 30 18 - 46
Potassium mg/L 16.8 14.7 - 18.8
Sodium mg/L 155 140 - 170
Sulfate mg/L 89.1 62.1 - 124
Boron mg/L 0.535 0.41 - 0.611
Ammonia mg/L  31.1 24.9 - 34.4
Nitrite (as N) mg/L 1.52 < 0.10 - 4.18
Nitrate (as N) mg/L .0.10 N/A
Chloride mg/L 194 125 - 248
Total Hardness (as CaCO3) mg/L 243 150 - 310
Calcium Hardness (as CaCO3)
mg/L
118 72-150
Selenium
µg/L
< 1.0
N/A
Arsenic
µg/L
1.3
< 1.0 - 1.6
Chromium
µg/L
1.7 < 1.0 - 2.2
Silica (Total) mg/L  16.8 13.2 - 21
Total Coliform Bacteria MPN  < 2* < 2 - 8
Manganese µg/L 46.9 37.1 - 55.9
Total Kjeldahl Nitrogen mg/L  34 24. - 39
*Median
Abbreviations: mg/L = milligrams per liter; µmhos = micromhos per centimeter; µg/L = micrograms per liter; MPN = most probable number
 
Most plants thrive with recycled water's higher nutrient content but some plants are sensitive to the higher salt content. www.TriValleyWaterWise.com has a list of plants known to tolerate higher salt content, as does East Bay Municipal Utility District's award-winning book, Plants and Landscapes for Summer-Dry Climates of the San Francisco Bay Region.