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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

October 2020

1 - 20

1

8

1

300

10/18/20 1   1 50
September 2020  1-30 16  400 
August 2020  1-31 16  500 
July 2020

1- 31

1 14 1 700
June 2020 1-30 0 0 450 
May 2020 1-31  15  750 
April 2020  1-30 1 15  2 750
March 2020 1-31 5 19 5 950
Feb. 2020 1-29 8 16 12 800
Jan. 2020

1-31

7

17

9

850

2019 Full Year 41 179 50 8,450
2018 Full Year 15 271 19 7,690

2017

Full Year

35

378

43

11,510

2016

Full Year

0

208

0

5,370