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Water Quality Testing

 

 

Monitoring Protocal

Water Quatlity Results

 

RWF Aerial

 

This regional map shows the Agency boundaries in relation to California, and includes the Pajaro and Salinas River Watersheds.

Monitoring Protocol

The Pajaro Valley Water Management Agency and the City of Watsonville closely monitor and test the tertiary treated, disinfected recycled water above and beyond what is required by the Master Reclamation Permit that was issued by the Regional Water Quality Control Board.

Below is a table that shows the constituents analyzed, and at what frequency, as required by the Master Reclamation Permit for the blended recycled water produced at the Recycled Water Facility.

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Constituent / Parameter

Units

Sample Type

Sampling Frequency

Daily Flow

mgd

Metered

Continuous

Turbidity

NTU

Metered

Continuous

Total Coliform

MPN/100 mL

Grab

Daily

CBOD

mg/L

24-hr composite

Weekly

Total Suspended Solids

mg/L

24-hr composite

Weekly

Total Nitrogen (as N)

mg/L

Grab

Monthly

Nitrate (as N)

mg/L

Grab

Monthly

Ammonia (as N)

mg/L

Grab

Monthly

pH

Units

Grab

Monthly

Total Dissolved Solids

mg/L

Grab

Monthly

Sodium

mg/L

Grab

Monthly

Chloride

mg/L

Grab

Monthly

Sulfate

mg/L

Grab

Monthly

Boron

mg/L

Grab

Monthly

 

Going beyond the sampling required by our permit (above), PV Water collects additional samples from a rotation of turnouts along the Coastal Distribution System at a minimum of once per month. These samples are analyzed for constituents relevant to the irrigation of crops. The constituents analyzed are provided in the table below.

Alkalinity, Total (as CaCO3)

Hardness (as CaCO3)

pH (Laboratory)

Total Nitrogen

Bicarbonate (as HCO3-)

Kjehldahl Nitrogen

Potassium

Turbidity

Boron

Langlier Index (60 deg. C)

SAR (Sodium Adsorption Ratio)

 

Bromide

Magnesium

SAR, Adjusted

 

Calcium

Nitrate (as NO3)

Sodium

 

Carbonate (as CaCO3)

Nitrate (as NO3-N)

Specific Conductance (E.C.)

 

Chloride

Nitrite (as NO2-N)

Sulfate

 

Fluoride

o-Phosphate-P

Total Dissolved Solids

 

 

Water Quality Results

All the water produced at the Recycled Water Facility has been in full compliance with permit regulations since recycled water distribution began.

The table below shows average water quality of select constituents sampled from a rotation of active turnouts along the distribution system for the most recent year, and for all the samples collected since the beginning of blended recycled water deliveries to present. To view a print friendly table with results going back to Spring, 2009, click here (PDF ~ 200 KB).

 

Q1 - 2015

Q2 - 2015

Q3 - 2015

Q4- 2015

Running Average

Number of Samples Analyzed

17

12

21

9

601

Sodium (mg/L)

83

99

92

87

94

Chloride (mg/L)

89

119

103

114

105

Nitrate as NO3 (mg/L)

35

44

34

56

27

Total Dissolved Solids (mg/L)

583

673

618

641

613

Specific Conductance (dS/cm)

0.98

1.11

1.06

1.09

641

Sodium Adsorption Ratio (SAR: unit-less)

2.23

2.60

2.44

2.30

2.56

 

*Table last updated January 4, 2016 and reflects sample results through December 31, 2015.

Please note the table immediately above represents only a portion of the constituents analyzed by the independent, ELAP certified laboratory. The constituents listed in the table were chosen by the PVWMA Water Quality and Project Operations Committee, now called the Projects and Facility Operations Committee. This Committee meets monthly and the public is invited to attend. Click here to go to where Committee Meeting agendas are posted.

For additional information, please contact the PVWMA at 831-722-9292, or by

email: info@pvwma.dst.ca.us

PVWMA