How can a PWS best determine whether a laboratory is approved to support their unregulated contaminant monitoring needs?
A PWS should be able to determine this from discussions with the laboratory. For all List 1 contaminants, except perchlorate, if a laboratory is certified under 40 CFR §141.28 for compliance analysis using an associated analytical method in Table 1 of 40 CFR §141.40, the laboratory is approved to perform unregulated contaminant monitoring analysis using any of the methods listed in the UCMR table as being approved for that unregulated contaminant. See F.3 regarding perchlorate. For unregulated contaminant monitoring purposes, certification may be by a certifying authority (State or Region). As with compliance monitoring, it is the responsibility of the PWS to ensure that they are using an appropriate laboratory. They may do so by asking the laboratory to demonstrate that it meets the approval requirements for the UCMR by providing evidence of the certification described above.
Related Questions
- Can a State require submission of unregulated contaminant monitoring data, which has been received by the PWS, before the specified State review period?
- If an unregulated contaminant becomes regulated, would the PWS be allowed to use the data from the UCMR (1999) as the initial monitoring profile?
- How can a PWS best determine whether a laboratory is approved to support their unregulated contaminant monitoring needs?
