OAR 333-061-0031: Maximum Residual Disinfectant Levels

Edition: Current OARD snapshotEffective: 2018-01-10Last verified: 2026-09-07

MRDLs are enforceable in the same manner as maximum contaminant levels and are specified in Table 7. The MRDL for chlorine and chloramines shall be calculated as a running annual average according to OAR 333-061-0036(4)(i). The MRDL for chlorine dioxide is determined by follow-up monitoring according to OAR 333-061-0036(4)(i). [ED. NOTE: To view attachments referenced in rule text, click here to view rule.]

Official history and status

Statutory/Other Authority: ORS 448.131

Statutes/Other Implemented: ORS 448.131, 448.150 & 448.273

History: PH 2-2018, amend filed 01/10/2018, effective 01/10/2018 PH 5-2016, f. 2-10-16, cert. ef. 4-1-16 PH 4-2009, f. & cert. ef. 5-18-09 OHD 23-2001, f. & cert. ef. 10-31-01 OHD 7-2000, f. 7-11-00, cert. ef. 7-15-00

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Official source: https://secure.sos.state.or.us/oard/