1. (a) Using the monitoring and calculation methods specified in sections 64534, 64534.2, 64535, and 64535.2, the primary MCLs for the disinfection byproducts shown in table 64533-A shall not be exceeded in drinking water supplied to the public.

   Table 64533-A Maximum Contaminant Levels and Detection Limits for Purposes of Reporting Disinfection Byproducts

   Disinfection Byproduct

   Maximum Contaminant Level ( mg/L)

   Detection Limit for Purposes of Reporting (mg/L)

   Total trihalomethanes (TTHM)

   0.080

   Bromodichloromethane

   0.0010

   Bromoform

   0.0010

   Chloroform

   0.0010

   Dibromochloromethane

   0.0010

   Haloacetic acids (five) (HAA5)

   0.060

   Monochloroacetic Acid

   0.0020

   Dichloroacetic Acid

   0.0010

   Trichloroacetic Acid

   0.0010

   Monobromoacetic Acid

   0.0010

   Dibromoacetic Acid

   0.0010

   Bromate

   0.010

   0.0050

   0.0010¹

   Chlorite

   1.0

   0.020

   1 For analysis performed using EPA Method 317.0 Revision 2.0, 321.8, or 326.0

2. (b) A system installing GAC, membranes, or other technology to limit disinfectant byproducts to comply with this section may apply to the State Board for an extension up to December 31, 2003. Applications for extensions shall include the results of disinfection byproduct monitoring, a description of the technology being installed and how it is expected to affect future disinfection byproduct levels, and a proposed schedule for compliance. If granted an extension, a system shall meet the schedule and interim treatment and monitoring requirements established by the State Board.

3. (c) The best technology, treatment techniques, or other means available for achieving compliance with the maximum contaminant levels for disinfection byproducts are identified in table 64533-B.

   Table 64533-B Best Available Technology Disinfection Byproducts

   Disinfection Byproduct

   Best Available Technology

   TTHM and HAA5

   Enhanced coagulation or enhanced softening or GAC10, with chlorine as the primary and residual disinfectant¹

   For all systems that disinfect their source water:

4. (1) Enhanced coagulation or enhanced softening, plus GAC10;
5. (2) Nanofiltration with a molecular weight cutoff ≤1000 Daltons; or

6. (3) GAC20²

   For consecutive systems and applies only to the disinfected water that consecutive systems buy or otherwise receive:²

7. (1) Systems serving ≥10,000 persons: improved distribution system and storage tank management to reduce residence time, plus the use of chloramines for disinfectant residual maintenance; and

8. (2) Systems serving <10,000 persons: improved distribution system and storage tank management to reduce residence time

   Bromate

   Control of ozone treatment process to reduce production of bromate

   Chlorite

   Control of treatment processes to reduce disinfectant demand and control of disinfection treatment processes to reduce disinfectant levels

   1 When using the monitoring and calculation methods specified in sections 64534, 64534.2(a), 64535, and 64535.2(a) and (b).

   2 When using the monitoring and calculation methods specified in sections 64534, 64534.2(d), 64535, and 64535.2(a) and (e).

Note: Authority cited: Sections 116271, 116350 and 116375, Health and Safety Code. Reference: Sections 116350, 116365 and 116370, Health and Safety Code.

History

1. New article 2 (sections 64533-64533.5) and section filed 5-18-2006; operative 6-17-2006 (Register 2006, No. 20).

2. Amendment of Tables 64533-A and 64533-B and Note filed 5-22-2012; operative 6-21-2012 (Register 2012, No. 21).

3. Change without regulatory effect amending subsection (b) and Note filed 6-2-2015 pursuant to section 100, title 1, California Code of Regulations (Register 2015, No. 23).