California Code of Regulations
Title 22 - Social Security
Division 4 - Environmental Health
Chapter 17.5 - Lead and Copper
Article 3 - Monitoring for Lead and Copper
Section 64678 - Determination of Exceedances of Lead and Copper Action Levels
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) The detection limits for purposes of reporting (DLRs) for lead and copper are as follows:
Table 64678-A. DLRs for Lead and Copper
Contaminant | DLR (mg/L) | |||
Lead.......................... | ..........................0.005 | |||
Copper.......................... | ..........................0.050 |
(b) For purposes of determining the difference in concentration between the source water and the 90th percentile tap results, the following shall apply:
(c) Analytical results below the DLRs for lead and copper specified shall be reported as zero.
(d) The lead action level is exceeded if the concentration of lead in more than 10 percent of the tap water samples collected during any period is greater than 0.015 mg/L (i.e., if the "90th percentile" lead level is greater than 0.015 mg/L).
(e) The copper action level is exceeded if the concentration of copper in more than 10 percent of the tap water samples collected during any period is greater than 1.3 mg/L (i.e., if the "90th percentile" copper level is greater than 1.3 mg/L).
(f) The 90th percentile lead and copper levels shall be computed as follows:
(g) The results of any monitoring conducted in addition to the minimum requirements of this section shall be considered by the system and submitted to the department for making any determinations.
1. New
section filed 12-11-95 as an emergency; operative 12-11-95 (Register 95, No.
50). A Certificate of Compliance must be transmitted to OAL by 4-9-96 or
emergency language will be repealed by operation of law on the following
day.
2. Refiling of 12-11-95 order, including amendment of NOTE,
filed 4-9-96 as an emergency; operative 4-10-96 (Register 96, No. 15). A
Certificate of Compliance must be transmitted to OAL by 8-8-96 or emergency
language will be repealed by operation of law on the following
day.
3. Certificate of Compliance as to 12-11-95 order transmitted
to OAL 8-7-96 and filed 9-16-96 (Register 96, No. 38).
4. Repealer
and new section filed 9-11-2003; operative 10-11-2003 (Register 2003, No.
37).
Note: Authority cited: Sections 100275, 116350, 116365, 116375 and 116385, Health and Safety Code. Reference: Sections 116325- 116750, Health and Safety Code.