§ 64663. Department Notification.

A supplier shall notify the Department as soon as possible, but no later than by the end of the next business day, or within 24 hours, whichever is less, by telephone or other equally rapid means whenever:

(a) A combined filter effluent turbidity exceedance occurs pursuant to table 64663:

Table 64663
Combined Filter Effluent Turbidity Exceedances
Requiring Department Notification
	And the turbidity of the
	combined filter effluent monitored and recorded
If a supplier uses...	pursuant to section 64655 . . .
(1) Any filtration technology	Exceeds 5.0 NTU at any time.
pursuant to section 64653
(2) Conventional or direct	(A) Exceeds 1 NTU for more than one continuous
filtration treatment and serves	hour;
10,000 or more persons	(B) Exceeds 1 NTU at four-hour intervals; or
	(C) Exceeds 1.0 NTU for more than eight
	consecutive hours.
(3) Conventional or direct	(A) For a supplier using a grab sample monitoring
filtration treatment and serves	program:
fewer than 10,000 persons	1. Exceeds 1 NTU; or
	2. Exceeds 1.0 NTU in more than two consecutive
	samples taken every four hours; and
	(B) For a supplier using a continuous monitoring
	program:
	1. If recording results at least once every 15
	minutes, equals paragraph (2)(A); or
	2. Equals paragraph (2)(B) or (2)(C).
(4) Diatomaceous earth or	Exceeds 1.0 NTU in more than two consecutive
slow sand filtration	samples taken every four hours.
(5) An alternative filtration	Exceeds the maximum performance standard
technology pursuant to	established pursuant to sections 64653(e), (f), (g),
section 64653	and (h).

(b) There is a failure to maintain a minimum disinfectant residual of 0.2 mg/L in the water being delivered to the distribution system. The supplier shall report whether or not the disinfectant residual was restored to at least 0.2 mg/L within four hours.

(c) An event occurs which may affect the ability of the treatment plant to produce a safe, potable water including but not limited to spills of hazardous materials in the watershed and unit treatment process failures.

(d) For a supplier avoiding filtration, the turbidity immediately prior to the first or only point of disinfectant application exceeds 5 NTU.

(e) A supplier discovers the occurrence of an acute infectious illness that may be potentially attributable to the water system.

HISTORY

1. New section filed 5-6-91; operative 6-5-91 (Register 91, No. 25).

2. Amendment of first paragraph and subsection (c), new subsections (e) and (f), and amendment of Note filed 6-8-98; operative 7-8-98 (Register 98, No. 24).

3. Amendment of subsections (a) and (b) and Note filed 12-13-2007; operative 1-12-2008 (Register 2007, No. 50).

4. Amendment of section and Note filed 5-22-2013; operative 7-1-2013 (Register 2013, No. 21).

Note

Note: Authority cited: Sections 116350, 116375, 131052 and 131200, Health and Safety Code. Reference: Sections 116350, 116375, 116450 and 116460, Health and Safety Code.