1 Regional Water Quality NEWSLETTER DATE: Report for October 2017 A Tempe, Glendale, Peoria, Chandler, Phoenix, ADEQ, CAP, SRP, Epcor NSF Central Arizona-Phoenix Long-Term Ecological Research ASU Regional Water Quality Partnership http://faculty.engineering.asu.edu/pwesterhoff/research/regional-water-quality-issues/
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Regional Water Quality NEWSLETTER · 1 Regional Water Quality NEWSLETTER DATE: Report for October 2017 A Tempe, Glendale, Peoria, Chandler, Phoenix, ADEQ, CAP, SRP, Epcor NSF Central
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Regional Water Quality NEWSLETTER
DATE: Report for October 2017
A Tempe, Glendale, Peoria, Chandler, Phoenix, ADEQ, CAP, SRP, Epcor
NSF Central Arizona-Phoenix Long-Term Ecological Research
1. Taste and Odor compound data collection focused on the Arizona Canal where there appears to
significant production of MIB. Both Saguaro and Bartlett had levels below the threshold detection levels
of 10 ng/l. Sampling on the Arizona Canal was done from Mesa Drive to Central Avenue. MIB levels
were 100 ng/l at Mesa Drive and they decreased to 77 ng/l at 68th Street but the MIB levels increased to
135 ng/l at Central Avenue. The data suggest more than one hot spot for MIB production which
hopefully can be identified with the help of SRP. Many thanks to the City of Mesa for their assistance in
Taste and Odor analysis!
2. DOC values for Saguaro Lake and Bartlett Lake were decreased to 4 mg/l which was lower than August.
DOC concentrations ranged from 2.3-4.0 mg/l at the inlets of water treatment plants which was also
about 1 mg/l lower than August.
3. Reservoir released from Bartlett and Saguaro are about equal creating a blend of Salt and Verde River
water. CAP water and groundwater use has decreased to approximately 15% of the water supply. Lake
Pleasant releases have stopped so the CAP water is river water
4. Microbial concentrations for coliforms decreased as compared to August when the highest values ever
observed were present. Many samples still exceeded 1,000 cfu/100ml which is well above historic norms.
A combination of rain, high temperatures and high nutrient levels are likely factors. Mycobacterium
concentrations were low and did not correlate with the higher coliform concentrations.
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Topics Du Jour
Microbial Water Quality Data
Over the years the regional water quality center has collected data on numerous different topics but very
little data has been collected on basic microbial water quality. Therefore, we have initiated microbial
sampling for E. Coli, total coliforms and mycobacterium in the canal system to determine potential
impacts on both water quality and sources of possible contamination. Note that Mycobacterium
samples require one month to process so they are from the previous month
All Values are cfu per 100 ml - October 2nd-3rd
Sample E. coli Coliform
Blank Average 0 0
AZ Canal at Highway 87 average 25 1384
South Canal below CAP Cross- connect average 30 1016
Cap Canal at Cross-connect average 13 912
AZ Canal at 56th St. average 27 1168
AZ Canal- Central Avenue average 21 2536
Pima Average 14 1552
AZ Canal above CAP Cross-connect average 4 912
Waddell Canal average 7 1528
Verde River @ Beeline average 30 1088
AZ Canal below CAP Cross-connect average 33 888
head of the Consolidated Canal average 36 1224
Middle of Consolidated Canal average 49 1656
Head of Tempe Canal average 27 1432
Mycobacterium (September) colonies
0
AZ Canal at Highway 87 3
South Canal below CAP Cross- connect 7
Cap Canal at Cross-connect 0
AZ Canal at 56th St. 4
AZ Canal- Central Avenue 3
AZ Canal at Pima 6
AZ Canal above CAP Cross-connect 2
Waddell Canal 0
Verde River @ Beeline 6
AZ Canal below CAP Cross-connect CONT
head of the Consolidated Canal 6
Middle of Consolidated Canal 5
3
Head of Tempe Canal 5
CONT – Contaminated with other bacteria
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Quick Update of Water Supplies for October 3rd, 2017
(during day of canal/WTP sampling – October 3rd, 2017)
Source Trend in supply Discharge to
water supply system
Flow into SRP Canal System
Dissolved organic carbon Concentration (mg/L) **
Salt River Reservoirs at 66% full
340 cfs 563 cfs into Arizona Canal
451 cfs into South Canal
93 cfs of CAP water into Arizona Canal
79 cfs Groundwater
Pumping into SRP Canals
4.0 mg/L
Verde River Reservoirs At 59% full
455 cfs 4.0 mg/L
Colorado River
Lake Pleasant is 56.5% full (Lake Powell is
60.2% full)
Lake Pleasant is* releasing 0 cfs
2.5 mg/L
Groundwater Pumping *** 79 cfs pumping by SRP
0.5 to 1 mg/L
*CAP is not releasing from Lake Pleasant **Concentration of DOC in the terminal reservoir ***CAP water is being delivered to the Arizona Canal. Data from the following websites: