Statutes, codes, and regulations
California Code Of Regulations
Title 22 - Social SecurityDivision 4 - Environmental HealthChapter 15 - Domestic Water Quality and Monitoring Regulations
Article 4 - Primary Standards-Inorganic Chemicals
Section 64431 - Maximum Contaminant Levels-Inorganic Chemicals

Cal. Code Regs. tit. 22 § 64431

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Current through Register 2024 Notice Reg. No. 49, December 6, 2024
Section 64431 - Maximum Contaminant Levels-Inorganic Chemicals

Public water systems shall comply with the primary MCLs in Table 64431-A as specified in this article.

Table 64431-A

Maximum Contaminant Levels Inorganic Chemicals

ChemicalMaximum Contaminant Level, mg/L
Aluminum1.
Antimony0.006
Arsenic0.010
Asbestos7 MFL*
Barium1.
Beryllium0.004
Cadmium0.005
Chromium (hexavalent)0.010
Chromium (total)0.05
Cyanide0.15
Fluoride2.0
Mercury0.002
Nickel0.1
Nitrate (as nitrogen)10.
Nitrate+Nitrite (sum as nitrogen)10.
Nitrite (as nitrogen)1.
Perchlorate0.006
Selenium0.05
Thallium0.002

* MFL=million fibers per liter; MCL for fibers exceeding 10 µm in length.

Cal. Code Regs. Tit. 22, § 64431

Note: Authority cited: Sections 116270, 116271, 116293(b), 116350, 116365, 116365.5 and 116375, Health and Safety Code. Reference: Sections 116365, 116365.5 and 116470, Health and Safety Code.

Note: Authority cited: Sections 116271, 116293(b), 116350, 116365, 116365.5 and 116375, Health and Safety Code. Reference: Sections 116365, 116365.5 and 116470, Health and Safety Code.

1. Amendment of article heading, repealer of section and renumbering and amendment of former section 64435 to section 64431 filed 9-8-94 as an emergency; operative 9-8-94 (Register 94, No. 36). A Certificate of Compliance must be transmitted to OAL by 1-6-95 or emergency language will be repealed by operation of law on the following day. For prior history, see Register 88, No. 51.
2. Amendment of article heading, repealer of section and renumbering and amendment of former section 64435 to section 64431 refiled 1-3-95 as an emergency; operative 1-3-95 (Register 95, No. 1). A Certificate of Compliance must be transmitted to OAL by 5-3-95 or emergency language will be repealed by operation of law on the following day.
3. Amendment of article heading, repealer of section, and renumbering and amendment of former section 64435 to section 64431 refiled 4-26-95 as an emergency; operative 4-26-95 (Register 95, No. 17). A Certificate of Compliance must be transmitted to OAL by 8-24-95 or emergency language will be repealed by operation of law on the following day.
4. Certificate of Compliance as to 4-26-95 order transmitted to OAL 5-5-95 and filed 6-19-95 (Register 95, No. 25).
5. Amendment of subsection (a) and table 64431-A, repealer of table 64431-B and subsection (b) and amendment of Note filed 3-23-98; operative 4-22-98 (Register 98, No. 13).
6. Amendment of Table 64431-A and amendment of Note filed 5-13-2003; operative 6-12-2003 (Register 2003, No. 20).
7. Amendment of section and Note filed 9-18-2007; operative 10-18-2007 (Register 2007, No. 38).
8. Amendment of subsection (a) - Table 64431-A and amendment of Note filed 10-29-2008; operative 11-28-2008 (Register 2008, No. 44).
9. Amendment of section and Note filed 5-28-2014; operative 7/1/2014 (Register 2014, No. 22).
10. Change without regulatory effect amending Table 64431-A and Note filed 7-16-2015 pursuant to section 100, title 1, California Code of Regulations (Register 2015, No. 29).
11. Change without regulatory effect amending Table 64431-A filed 9-11-2017 pursuant to section 100, title 1, California Code of Regulations (Register 2017, No. 37).
12. Amendment of section and NOTE filed 7-24-2024; operative 10/1/2024 (Register 2024, No. 30).