California Code of Regulations
Title 22 - Social Security
Division 4 - Environmental Health
Chapter 15 - Domestic Water Quality and Monitoring Regulations
Article 5.5 - Primary Standards-Organic Chemicals
Section 64444 - Maximum Contaminant Levels-Organic Chemicals

Universal Citation: 22 CA Code of Regs 64444
Current through Register 2024 Notice Reg. No. 38, September 20, 2024

The MCLs for the primary drinking water chemicals shown in table 64444-A shall not be exceeded in the water supplied to the public.

Table 64444-A

Maximum Contaminant Levels Organic Chemicals

Chemical Maximum Contaminant Level, mg/L
(a) Volatile Organic Chemicals (VOCs)
Benzene...................................... 0.001
Carbon Tetrachloride...................................... 0.0005
1,2-Dichlorobenzene...................................... 0.6
1,4-Dichlorobenzene...................................... 0.005
1,1-Dichloroethane...................................... 0.005
1,2-Dichloroethane...................................... 0.0005
1,1-Dichloroethylene...................................... 0.006
cis-1,2-Dichloroethylene...................................... 0.006
trans-1,2-Dichloroethylene...................................... 0.01
Dichloromethane...................................... 0.005
1,2-Dichloropropane...................................... 0.005
1,3-Dichloropropene...................................... 0.0005
Ethylbenzene...................................... 0.3
Methyl-tert-butyl ether...................................... 0.013
Monochlorobenzene...................................... 0.07
Styrene...................................... 0.1
1,1,2,2-Tetrachloroethane...................................... 0.001
Tetrachloroethylene...................................... 0.005
Toluene...................................... 0.15
1,2,4-Trichlorobenzene...................................... 0.005
1,1,1-Trichloroethane...................................... 0.200
1,1,2-Trichloroethane...................................... 0.005
Trichloroethylene...................................... 0.005
Trichlorofluoromethane...................................... 0.15
1,1,2-Trichloro-1,2,2-Trifluoroethane...................................... 1.2
Vinyl Chloride...................................... 0.0005
Xylenes...................................... 1.750*
(b) Synthetic Organic Chemicals (SOCs)
Alachlor...................................... 0.002
Atrazine...................................... 0.001
Bentazon...................................... 0.018
Benzo(a)pyrene...................................... 0.0002
Carbofuran...................................... 0.018
Chlordane...................................... 0.0001
2,4-D...................................... 0.07
Dalapon...................................... 0.2
Dibromochloropropane...................................... 0.0002
Di(2-ethylhexyl)adipate...................................... 0.4
Di(2-ethylhexyl)phthalate...................................... 0.004
Dinoseb...................................... 0.007
Diquat...................................... 0.02
Endothall...................................... 0.1
Endrin...................................... 0.002
Ethylene Dibromide...................................... 0.00005
Glyphosate...................................... 0.7
Heptachlor...................................... 0.00001
Heptachlor Epoxide...................................... 0.00001
Hexachlorobenzene...................................... 0.001
Hexachlorocyclopentadiene...................................... 0.05
Lindane...................................... 0.0002
Methoxychlor...................................... 0.03
Molinate...................................... 0.02
Oxamyl...................................... 0.05
Pentachlorophenol...................................... 0.001
Picloram...................................... 0.5
Polychlorinated Biphenyls...................................... 0.0005
Simazine...................................... 0.004
Thiobencarb...................................... 0.07
Toxaphene...................................... 0.003
1,2,3-Trichloropropane...................................... 0.000005
2,3,7,8-TCDD (Dioxin)...................................... 3x10-8
2,4,5-TP (Silvex)...................................... 0.05

1. Repealer of section and renumbering and amendment of section 64445.5 to section 64441 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 90, No. 13.
2. Repealer of section and renumbering and amendment of section 64445.5 to section 64444 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. Repealer of section and renumbering and amendment of former section 64444.5 to section 64444 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 including amendment of Table 64444-A transmitted to OAL 5-5-95 and filed 6-19-95 (Register 95, No. 25).
5. Editorial correction of Ethylene Dibromide entry (Register 95, No. 38).
6. Amendment of subsection (a) of Table and amendment of NOTE filed 4-17-2000; operative 5-17-2000 (Register 2000, No. 16).
7. Amendment of Table 64444-A filed 5-13-2003; operative 6-12-2003 (Register 2003, No. 20).
8. Amendment of first paragraph, table and NOTE filed 12-14-2017; operative 12-14-2017 pursuant to Government Code section 11343.4(b)(3) (Register 2017, No. 50).

Note: Authority cited: Sections 116271, 116350 and 116365, Health and Safety Code. Reference: Sections 116365, 116385 and 116555, Health and Safety Code.

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