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 California Code of Regulations (Last Updated: August 6, 2014)
 Title 22. Social Security
 Division 4. Environmental Health
 Chapter 15. Domestic Water Quality and Monitoring Regulations
 Article 4. Primary Standards -Inorganic Chemicals

§ 64431. Maximum Contaminant Levels - Inorganic Chemicals.  

Latest version.
  • 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
    Maximum Contaminant
    Chemical
    Level, mg/L
    Aluminum
    1.
    Antimony
    0.006
    Arsenic
    0.010
    Asbestos
    7 MFL*
    Barium
    1.
    Beryllium
    0.004
    Cadmium
    0.005
    Chromium
    0.05
    Cyanide
    0.15
    Fluoride
    2.0
    Hexavalent chromium
    0.010
    Mercury
    0.002
    Nickel
    0.1
    Nitrate (as NO3)
    45.
    Nitrate+Nitrite (sum as nitrogen)
    10.
    Nitrite (as nitrogen)
    1.
    Perchlorate
    0.006
    Selenium
    0.05
    Thallium
    0.002
    * MFL=million fibers per liter; MCL for fibers exceeding 10 μm in length.
HISTORY
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 A Certificate of Compliance must be transmitted to OAL by 1-6-95 or emergency language will be repealed by operation of law on the following day.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 A Certificate of Compliance must be transmitted to OAL by 5-3-95 or emergency language will be repealed by operation of law on the following day.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 A Certificate of Compliance must be transmitted to OAL by 8-24-95 or emergency language will be repealed by operation of law on the following day.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).

Note

Note: Authority cited: Sections 116293(b), 116350, 116365, 116365.5, 116375, 131052 and 131200, Health and Safety Code. Reference: Sections 116365, 116365.5 and 116470, Health and Safety Code.