Q&A
Comparison to Portland, Oregon's loss of FAD due to cryptosporidium
1:58:38
·
131 sec
Council Member Gennaro inquires about the comparison between NYC's water system and Portland, Oregon's loss of its Filtration Avoidance Determination (FAD) due to cryptosporidium detection. David Warne, Assistant Commissioner for Bureau of Water Supply, explains the similarities and differences between the two situations.
- Portland lost its FAD due to cryptosporidium detection from wildlife sources
- NYC faces similar sources of cryptosporidium from wildlife
- Unlike Portland at the time, NYC has ultraviolet disinfection as a second barrier of treatment
- UV treatment is effective at preventing cryptosporidium reproduction, which causes illness
- NYC has very low levels of pathogens at key intake points and feels confident in its protection against pathogen introduction
James F. Gennaro
1:58:38
Oh, really?
1:58:39
Oh, I I am like, okay.
1:58:42
Good for shams.
1:58:44
He swore for my office onspuntime.
1:58:48
But then he realized that, what am I doing here?
1:58:51
You know?
1:58:54
Josh don't get any ideas.
1:58:58
You made reference to Portland Oregon.
1:59:01
They lost their fad.
1:59:02
They had pathogens that they here to 4 in that scene.
1:59:13
You know, like, we're all concerned about Portland, but, you know, do we have an analog here in terms of same kind of pathogens or whatever or
David Warne
1:59:29
Okay.
1:59:29
Okay.
1:59:31
So the detection, they they had a a pathogen detection of cryptosporidium, which they had down identified as being from a wildlife source.
1:59:40
And, yes, we do have that similar sources of cryptosporidium from wildlife.
1:59:47
At the time, Portland did not have Well, we we have ultraviolet disinfection.
James F. Gennaro
1:59:54
Right.
David Warne
1:59:54
Right?
1:59:54
And so we have that second barrier of disinfection between the chlorine and ultraviolet.
James F. Gennaro
1:59:59
But, yeah, yeah, you have the crypto don't don't care about chlorine.
2:00:02
How about the UV?
2:00:03
Does that get the crypto.
David Warne
2:00:04
The UV is effective at ensuring that the cryptosporidium, the pathogens cannot reproduce.
2:00:13
It doesn't remove them from the water, but it renders them inability to reproduce and that reproduction in in the human gut is what causes illness.
2:00:24
So we have we have very low levels of pathogens at our key points, our regulated intakes.
2:00:31
And then with the two barriers of disinfection, we feel confident that we're protected against pathogen introduction into the distribution system.
James F. Gennaro
2:00:41
Good.
2:00:41
Good.
2:00:41
I want that.
2:00:42
Good.
2:00:42
Good answer.
William Scarborough
2:00:48
Oh,
