US · guidance
CMS SOM App. H, Tag V201
ANSI/AAMI RD52:2004 Requirements as Adopted by Reference 42 CFR 494.40(a)
6.2.7 Reverse osmosis: (Chemical analysis: frequency)
Chemical analysis for the contaminants listed in 4.1.1 (Table 1) should be done when the
RO system is installed, when membranes are replaced, and at not less than annual intervals
thereafter to ensure that the limits specified in 4.1.1 are met (see Table 1). Chemical
analyses should be done when seasonal variations in source water suggest worsening
quality or when rejection rates fall below 90%.
Interpretive Guidance § 494.40(a)
If your State has more stringent requirements, those must be followed to avoid potential
noncompliance with 42 C.F.R. § 494.20..Accordingly, facilities who fail to comply with state and
local laws would be cited at V100 or V101.
History
Rev.
Provenance
- Source
- cms.gov
- Retrieved
- 2026-07-22
- Edition
- som-2026-07-22
- Content hash
44bc5e57eda19d7526e62ebda65a99c94eb70477b55972c5d441651053fe78b7
The link goes to the issuing authority’s own document — the one we read to produce this record. Where a source publishes whole titles rather than sections, your browser may need a moment to jump to the provision.
Unofficial copy of government-published law, reproduced from official sources with full provenance. Not an official publication; verify against official sources before relying on it in a filing. Records in the 'guidance' corpus, and only that corpus, are sub-regulatory (interpretive guidelines, survey procedures) and are not binding law. Validity bounds follow each jurisdiction's declared temporalBasis.