Regional Water Quality and T&O Project

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Regional Water Quality Issues: Reducing Taste and Odor and Other Algae-Related Problems for Surface Water Supplies in Arid Environments

(A Cooperative Research and Implementation Program among ASU, SRP, CAP, EPCOR and the Cities of Phoenix, Tempe, Glendale, Chandler and Peoria)

Download our recent Regional Water Quality Newsletter (and previous newsletters)

Download presentations from our September 2013 Workshop: Sept Workshop presentations

Download presentations from our September 9, 2012 Regional Water Quality Workshop (it is a zipped file): T&O documents/Final PResentation with

Download presentations from our September 30, 2011 Regional Water Quality Workshop

Download MS Thesis (Darla Gill 2004) on Effects of forest fires on water qualityto help understand effects of current 2011 forest fire on potential water quality impacts

Download the September 17, 2010 Regional Water Quality WORKSHOP slides

Download Final Report of Pharmaceuticals and Personal Care Products in Arizona Waters– funded by Salt River Project and Central Arizona Project

Download Susan Neuer Final Report for AWWA TEC and WQTD Taste and Odor Committee entitled Feasibility Study for Early Warning Systems for Algae-induced Tastes and Odors

Download September 2009 Workshop presentation

Download October 2008 Workshop presentation

Download September 2007 Workshop presentation

Download September 2006 Workshop presentation

Click here to download the August 2005 Workshop Presentation on Regional Water Quality Issues

Click Here to Download the 2004 Final Report (6.5 MB PDF)

Click Here to Download (4.9 MB pdf) the 2003 Final Report (posted August 2004)

Click Here to Download PDF from the 2004 WQTC Presentation on Algae Metabolites in Arizona Surface Waters

Click Here to download (2.8 MB pdf) the Final Technical Report (1999-2002)

Click Here to download (1.4 MB pdf) a Utility User-Friendly Guidance Manual for T&O Control (2002)

Click Here to download (2.8 MB pdf) the final project presentation (August 8, 2002)

Go to T&O Implementation Selection Flowchart

Go to  Algae Taxonomic Guide for T&O Causing Algae

T&O website links

Connect to Information on Algae Toxins (June 2004 Updated)

Click here to download MS Thesis on Algal Toxins by Michelle Cummings 2002

The goal of the proposed project is to develop a comprehensive management strategy to reduce algae-related water quality problems for drinking water supplies in arid environments.

All data presented on this website are preliminary results, and are intended for use as guidance by regional water quality operators in the Phoenix-metropolitan area. Contact Paul Westerhoff at 480-965-2885 for questions (

Click Here to Go to the AWWARF Project Website (#2775) on Ozone-enhanced biofiltration for MIB and Geosmin Removal

Here is a link to a University of Arizona study of the water supply for metro-Phoenix:

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Site Descriptions
Field sampling sites included locations along the CAP and SRP canals and the Verde and Salt Rivers including Bartlett Lake, Saguaro Lake and Lake Pleasant (Table 1, Figure 1). Locations along canals, rivers, and water treatment plants throughout the Valley region were selected as sample sites in order to assess taste and odor problems through out the entire water collection system. A multi-barrier approach will be taken to address taste and odor problems in drinking water supplies. Sample sites were selected to include locations along the entire water collection system in the Valley; from source water in rivers and lakes to finished water in water treatment plants. Water samples were collected monthly from August 1999 to June 2000 in the CAP, Verde River, Salt River, and SRP sample clusters.

Table 1 – Description of sample sites

site # site description Latitude Longitude
CAP Canal Cluster
R1 CAP canal above Waddell Canal N33 46.893 W112 17.174
R2A Lake Pleasant integrated sample N33 51.105 W112 16.213
R2B Lake Pleasant integrated sample N33 51.105 W112 16.213
R3 Waddell Canal N33 47.897 W112 15.422
R4 Cap Canal at 7th St. N33 42.079 W112 03.935
R11 CAP Canal at Cross-connect N33 30.858 W111 41.603
Verde River Cluster
R5 Verde River btwn Horseshoe and Bartlett N33 57.620 W111 42.280
R6A Bartlett Lake near outlet N34 00.000 W111 05.625
R6B Bartlett Lake near outlet N34 00.000 W111 05.625
R7 Verde River below Bartlett Lake N33 50.304 W111 38.595
R20 Verde River at Tangle (USGS)
Salt River Cluster
R8 Salt River inlet to Saguaro Lake N33 33.349 W111 27.450
R9A Saguaro Lake near inlet N33 34.053 W111 32.229
R9B Saguaro Lake near inlet N33 34.053 W111 32.229
R10 Salt River below Saguaro (Blue Point Bridge) N33 33.335 W111 34.436
SRP Canal Cluster
R12 AZ Canal above CAP Cross-connect N33 31.022 W111 41.589
R13 AZ Canal below CAP Cross-connect N33 30.941 W111 42.023
R14 AZ Canal – Inlet to Squaw Peak WTP
R15 Squaw Peak WTP treated water
R16 AZ Canal – Inlet to Deer Valley WTP
R17 Deer Valley WTP treated water
R18 South Canal at Val Vista WTP
R19 Val Vista WTP treated water
R21 AZ Canal at Central
R22 AZ Canal at 56th Street

Figure 1 – Map of Sample Sites

MIB Data

Contour plot for MIB concentration as a function of sampling date and sampling site location

Milt Sommerfeld can be emailed at

Larry Baker can be reached at

Baker Environmental Consulting
8001 Greenwood DriveMoundview, MN 55112

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