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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

More Contact Info

Cryptosporidium Monitoring Results

As agreed upon in the Bilateral Compliance Agreement with OHA, 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 be found on the Cryptosporidium Documents page

Month

Date(s)

Number of Samples

Number of Oocysts

Approx.
Volume (L)

Positive

Total

August 2019

1-31

0

8

0

400

July 2019

1-31 0 9  0 450 

June 2019

1-30

0

11 

0

550

May 2019

1-31

1

17

1

850

April 2019

1-30

8

18

10

900

Mar. 2019

1-31

4

17 

850 

Feb. 2019

1-28

7  16 7  800 
Jan. 2019 1-31 8 18 14 900
Dec. 2018 1-31 7 18 10 900

Nov. 2018

1-30

2 28 2 620

Oct. 2018

1-31

1 75 1 790

Sept. 2018

1-30

0 45 0 450

Aug. 2018

1-31

0 16 0 410

July 2018

1-31

10 0 500 

June 2018

1-30

0

8

0

400 

May 2018

1-31 0 10 0 500
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

2017

Full Year

35

378

43

11,510

2016

Full Year

0

208

0

5,370