PURPOSE: This rule establishes requirements for reports of water sample analyses and monitoring.

1. (1) General Information. Except where a shorter period is specified in this rule, the supplier of water shall report to the department the results of any test measurement or analysis, except operational analyses required by 10 CSR 60-4.080(3) other than those specified in sections (4) and (5) of this rule, within the first ten (10) days following the month in which the result is received or the first ten (10) days following the end of the required monitoring period as stipulated by the department, whichever of these is shortest.
2. (2) Within forty-eight (48) hours a supplier of water must report to the department any failure to comply with any drinking water regulation, including failure to comply with monitoring requirements, except where a shorter period is specified by the department.
3. (3) A supplier of water is not required to report analytical results to the department when a state laboratory performs the analysis and reports the results to the department.
4. (4) Turbidity measurements as required by 10 CSR 60-4.080(3) must be reported within ten

5. (10) days after the end of each month the system serves water to the public. Information that must be reported includes:

   1. (A) The total number of filtered water turbidity measurements taken during the month;
   2. (B) The number and percentage of filtered water turbidity measurements taken during the month which are less than or equal to the turbidity limits specified in 10 CSR 60- 4.050; and
   3. (C) The date and value of any turbidity measurements taken during the month which exceed five (5) nephelometric turbidity units (NTU).

6. (5) Disinfection information must be reported within ten (10) days after the end of each month the system serves water to the public.

   1. (A) Information that must be reported includes:

      1. 1. For each day, the lowest measurement

of residual disinfectant concentration in milligrams per liter (mg/l) in water entering the distribution system;

1. 2. The date and duration of each period

when the residual disinfectant concentration in water entering the distribution system fell below 0.5 mg/l free chlorine or one (1) mg/l chloramines and when the department was notified of the occurrence; and

1. 3. The following information on the

samples taken in the distribution system:

1. A. Number of instances where the

residual disinfectant concentration is measured;

1. B. Number of instances where the

residual disinfectant concentration is not measured but the heterotrophic bacteria plate count (HPC) is measured;

1. C. Number of instances where the

residual disinfectant concentration is measured but is less than 0.2 mg/l and no HPC is measured;

1. D. Number of instances where resid-

ual disinfectant concentration is less than 0.2 mg/l and where the HPC is greater than five hundred per milliliter (HPC > 500/ml);

1. E. Number of instances where the

residual disinfectant concentration is not measured and the HPC is greater than five hundred per milliliter (HPC > 500/ml); and

1. F. For the current and previous month

the system serves water to the public, the value of V in the following formula: (c + d + e) × 100 V= a + b

where: V = the percentage of time that the disinfectant residual is less than the required residual; a = the value in subparagraph (5)(A)3.A. of this rule; b = the value in subparagraph (5)(A)3.B. of this rule; c = the value in subparagraph (5)(A)3.C. of this rule; d = the value in subparagraph (5)(A)3.D. of this rule; and e = the value in subparagraph (5)(A)3.E. of this rule.

1. (B) If the department determines, based upon site-specific considerations, that a system has no means for having a sample transported and analyzed for HPC by a certified laboratory within the requisite time and temperature conditions specified in 10 CSR 60-5 and that the system is providing adequate disinfection in the distribution system, the requirements of paragraph (5)(A)3. do not apply.
2. (C) A system need not report the data listed in subsection (5)(A) of this rule if all of that data remains on file at the system and the 10 CSR 60-7

department determines that the system has submitted all the information required by subsection (5)(A) of this rule for at least twelve (12) months.

1. (6) Each system, upon discovering that a waterborne disease outbreak potentially attributable to that water system has occurred, must report that occurrence to the department as soon as possible but no later than by the end of the next business day. If the system is notified by the department or the Department of Health of an outbreak, the reporting requirement of this section is waived.
2. (7) A supplier of water is required to submit proof to the department that public notification has been made within ten (10) days of the date that the notice was to have been made. Proof of public notification may include, but is not limited to, a copy of the affidavit of publication, a copy of the public notice, a copy of the mailing list of people sent the public notice or a picture of the posted notices.

AUTHORITY: section 640.100, RSMo (Cum. Supp. 1989).* Original rule filed May 4, 1979, effective Sept. 14, 1979. Amended: Filed April 14, 1981, effective Oct. 11, 1981. Amended: Filed July 12, 1991, effective Feb. 6, 1992. *Original authority 1939, amended 1978, 1981, 1982, 1988, 1989.