California Code of Regulations › Title 22 - Social Security › Division 4 - Environmental Health › Chapter 15 - Domestic Water Quality and Monitoring Regulations › Article 4 - Primary Standards-Inorganic Chemicals › Section 64431 - Maximum Contaminant Levels-Inorganic Chemicals

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
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
Chemical
Maximum Contaminant 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 nitrogen)
10.
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.
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					 must be transmitted to OAL by 1-6-95 or emergency language will be repealed by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					 must be transmitted to OAL by 5-3-95 or emergency language will be repealed by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					 must be transmitted to OAL by 8-24-95 or emergency language will be repealed by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).
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.