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The City of Portland, Oregon

Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.

Customer Service: 503-823-7770

GENERAL INFORMATION: 503-823-7404

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Cryptosporidium Treatment Variance Monitoring Results

As agreed upon in the Bilateral Compliance Agreement, the Portland Water Bureau monitors for Cryptosporidium from the Bull Run raw water intake. Individual detections for the current month of monitoring as well as a summary of the previous 12 months can be found below.

 Results are updated:

-         Within 24 hours after each Cryptosporidium detection.

-         Weekly, for a month following the most recent detection.

-         Monthly when there have been no detections for over a month.

 Detailed monthly reports can found on the Cryptosporidium Documents page

Month

Date(s)

Number of Samples

Number of Oocysts

Approx.
Volume (L)

Positive

Total

May 2018

Total (Through 5/24/18)

0

8

0

400

April 2018

1-30

1

14 1 700

March 2018

1-31

12 600 

Feb. 2018

1-28

1 16 1 800

Jan. 2018

1-31 3 19 4 950

Dec. 2017

1-31

6

17

7

850

Nov. 2017

1-30

6

17

7

850

Oct. 2017

1-31

7

91

8

1,060

Sept. 2017

1-30

2

80

2

890

Aug. 2017

1-31

0

35

0

960

July 2017

1-31

0

17

0

850

June 2017

1-30

0

16

0

800

May 2017

1-31

0

22

0

1,100

April 2017

1-30

0

21

0

1,050

March 2017

1-31

2

21

2

1,050

Feb. 2017

1-28

9

21

11

1,050

Jan. 2017

1-31

3

20

6

1,000

2016

 Full Year

0

208

0

5,370