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Consumer Related Water Testing Questions
Do New York City residents receive free lead testing for their drinking water?
How can I tell if my water contains too much lead?
How can I get my tap water tested?
How do I have my water tested for lead?
I am attempting to understand the contaminant values I received after having my water tested. It uses different units of measurement than the EPA website does for the contaminants. How do I compare?
Is there a national list of all state certified laboratories that analyze drinking water?
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General Laboratory Questions
Can the following tests can be combined. Fecal coliforms per Standard Methods 9221E and the E. coli per Standard Methods 9221F?
Where can I find a list of EPA-approved turbidimeters?
How much does it cost to become a member of EPA's Water Laboratory Alliance?
A public water system (PWS) must collect total coliform repeat samples within 24-hours of being notified of the positive results unless the state grants an extension due to logistical sample collection problems (40 CFR 141.21(b)(1)). How does EPA define l
Appendix B to 40 CFR Part 136 is proposed to be changed with the current MUR. How will this be applied to the SDWA? Some approved methods reference Appendix B of part 136 (example: OIA-1677 and HachTNTplus 835/836 Method 10206) will this change their MDL?
I am interested if the US EPA has a requirement on pH Meter Calibration QA/QC. If so, I would like to know the procedure. Specifically, I would like to know if the US EPA requires a duplicate pH analysis be analyzed once every ten samples.
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Laboratory Questions On Analytical Methods
Is it acceptable to use laboratory generated control limits that extend beyond limits referenced in analytical drinking water methods?
How long should lab certifications be kept?
I need clarification on what is considered to be acceptable remedial action for a laboratory fortified blank QC sample that does not meet the acceptance criteria of the reference EPA Method.
Are hold times meant to be to the minute of collection or day of collection? For example, for a 14 day holding time, would a sample collected at 10:30 expire at 10:30 on day 14 or at 23:59 on day 14?
When a LFB recovery fails the method acceptance criteria, must all samples prepared together in the same batch be re-prepared at all times, or only if the source of the failure is traced to a source other than the spiking of the sample?
Many of the SDWA chemistry methods list holding times in number of days. Are hold times meant to be to the minute of collection or day of collection?
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