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 10 CSR 60-7

that data remains on file at the system and the 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) Reporting and Record Keeping Requirements for Disinfection By-Products and Enhanced Surface Water Treatment.

   1. (A) Compliance Dates.

      1. 1. CWS and NTNCWS serving ten

thousand (10,000) or more persons and using surface water or groundwater under the direct influence of surface water must comply with these requirements beginning December 16, 2001.

1. 2. CWS and NTNCWS serving fewer

than ten thousand (10,000) persons and using surface water or groundwater under the direct influence of surface water, and systems using only groundwater not under the direct influence of surface water, must comply with these requirements beginning December 16, 2003.

1. 3. Transient NCWSs serving ten thou-

sand (10,000) or more persons and using surface water or groundwater under the direct influence of surface water and using chlorine dioxide as a disinfectant or oxidant must comply with any requirements for chlorine dioxide and chlorite in this rule beginning December 16, 2001.

1. 4. Transient NCWSs serving fewer than

ten thousand (10,000) persons, using surface water or groundwater under the direct influence of surface water, and using chlorine dioxide as a disinfectant or oxidant, and systems using only groundwater and using chlorine dioxide as a disinfectant or oxidant, must comply with any requirements in this rule for chlorine dioxide and chlorite in this rule beginning December 16, 2003.

1. (B) Disinfection By-Products. Systems must report the information specified in the following table: System monitoring for TTHM and HAA5 under the requirements of 10 CSR 60-4.090(3)(B) on a quarterly or more frequent basis.

   System monitoring for TTHMs and HAA5 under the requirements of 10 CSR 60-4.090(3)(B) less

   System monitoring for bromate under the requirements of 10 CSR 60-4.090(3)(B).

   1 The department may choose to perform calculations and determine whether the MCL was exceeded, in lieu of

   having the system report that information.

2. (C) Disinfectant Residuals. Systems must report the information specified in the following table:

   System monitoring for chlorine or

   System monitoring for chlorine

   1The department may choose to perform calculations and determine whether the MRDL was exceeded, in lieu of having the

   system report that information. If you are...

   If you are...

chloramines under the requirements of 10 CSR 60- 4.090(3)(C).

dioxide under the requirements of 10 CSR 60- 4.090(3)(C). (1) The number of samples taken during each month of the last quarter. (2) The monthly arithmetic average of all samples taken in each month for the last 12 months. (3) The arithmetic average of all monthly averages for the last 12 months. (4) Whether the MRDL was exceeded.

1. (1) The dates, results, and locations of samples taken during the last quarter.
2. (2) Whether the MRDL was exceeded.
3. (3) Whether the MRDL was exceeded in any two consecutive daily samples and whether the resulting violation was acute or nonacute. You must report...1
4. (1) The number of samples taken during the last quarter.
5. (2) The location, date, and result of each sample taken during the last quarter.
6. (3) The arithmetic average of samples taken in the last quarter.
7. (4) The annual arithmetic average of the quarterly arithmetic averages of this section for the last four quarters.
8. (1) The location, date, and result of the last sample taken.
9. (1) The number of samples taken during the last quarter.
10. (2) The location, date, and result of each sample taken during the last quarter.
11. (3) The arithmetic average of the monthly arithmetic averages of all samples taken in the last year.

12. (4) Whether the MCL was exceeded.

    You must report...1

1. (D) Disinfection By-Product Precursors and Enhanced Coagulation or Enhanced Softening. Systems must report the information specified in the following table:

   If you are...

   System monitoring monthly or quarterly for TOC under the requirements of 10 CSR 60-4.090(4)(D) and required to meet the enhanced coagulation or enhanced softening requirements in 10 CSR 60-4.090(4)(D)3.

   System monitoring monthly or quarterly for TOC under the requirements of 10 CSR 60-4.090(4)(D) and meeting one or more of the alternative compliance criteria in 10 CSR 60- 4.090(4)(D)1. or 2.

   1The department may choose to perform calculations and determine whether the treatment technique was met, in lieu of hav-

   ing the system report that information. 10 CSR 60-7

   You must report...1

2. (1) The number of paired (source water and treated water, prior to continuous disinfection) samples taken during the last quarter.
3. (2) The location, date, and result of each paired sample and associated alkalinity taken during the last quarter.
4. (3) For each month in the reporting period that paired samples were taken, the arithmetic average of the percent reduction of TOC for each paired sample and the required TOC percent removal.
5. (4) Calculations for determining compliance with the TOC percent removal requirements.
6. (5) Whether the system is in compliance with the enhanced coagulation or enhanced softening percent removal requirements for the last four (4) quarters.
7. (1) The alternative compliance criterion that the system is using.
8. (2) The number of paired samples taken during the last quarter.
9. (3) The location, date, and result of each paired sample and associated alkalinity taken during the last quarter.
10. (4) The running annual arithmetic average based on monthly averages (or quarterly samples) of source water TOC for systems meeting a criterion in 10 CSR 60-4.090(4)(D)1.A. or C. or of treated water TOC for systems meeting the criterion in 10 CSR 60- 4.090(4)(D)1.B.
11. (5) The running annual arithmetic average based on monthly averages (or quarterly samples) of source water SUVA for systems meeting the criterion in 10 CSR 60-4.090(4)(D)1.E. or of treated water SUVA for systems meeting the criterion in 10 CSR 60-4.090(4)(D)1.F.
12. (6) The running annual average of source water alkalinity for systems meeting the criterion in 10 CSR 60-4.090(4)(D)1.C. and of treated water alkalinity for systems meeting the criterion in 10 CSR 60-4.090(4)(D)2.
13. (7) The running annual average for both TTHM and HAA5 for systems meeting the criterion in 10 CSR 60-4.090(4)(D)1.C. or D.
14. (8) The running annual average of the amount of magnesium hardness removal (as CaCO3, in mg/l) for systems meeting the criterion in 10 CSR 60-4.090(4)(D)2.B.
15. (9) Whether the system is in compliance with the particular alternative compliance criterion in 10 CSR 60-4.090(4)(D)1. or 2.

16. (7) Enhanced Filtration and Disinfection Reporting and Record Keeping Requirements. In addition to the reporting and record keeping requirements in sections (5) and (8) of this rule, a public water system subject to the requirements of 10 CSR 60-4.055(6) that provides conventional filtration treatment must report monthly to the department the information specified in subsections (7)(A) and (7)(B) of this rule beginning January 1, 2002. In addition to the reporting and record keeping requirements in sections (5) and (8) of this rule, a public water system subject to the requirements of 10 CSR 60-4.055(6) that provides filtration approved under 10 CSR 60-4.050(3)(G) must report monthly to the department the information specified in subsection (7)(A) of this rule beginning January 1, 2002. The reporting in subsection (7)(A) of this rule takes the place of the reporting specified in section (4) of this rule.

    1. (A) Turbidity measurements as required by 10 CSR 60-4.050(3)(B) must be reported within ten (10) days after the end of each month the system serves water to the public. Information that must be reported includes:

       1. 1. The total number of filtered water

turbidity measurements taken during the month;

1. 2. The number and percentage of fil-

tered water turbidity measurements taken during the month which are less than or equal to the turbidity limits specified in 10 CSR 60- 4.050(3)(B)1. or 2.; and

1. 3. The date and value of any turbidity

measurements taken during the month which exceed 1 NTU for systems using conventional filtration treatment, or which exceed the applicable maximum level.

1. (B) Systems must maintain the results of individual filter monitoring taken under 10 CSR 60-4.050(3)(E) for at least three (3) years. Systems must report that they have conducted individual filter turbidity monitoring under 10 CSR 60-4.050(3)(E) within ten

1. (10) days after the end of each month the system serves water to the public. Systems must report the individual filter turbidity measurement results within ten (10) days after the end of each month the system serves water to the public only if measurements demonstrate one

2. (1) or more of the conditions in paragraphs (7)(B)1.–2. of this rule. Systems that use lime softening may apply to the department for alternative exceedance levels for the levels specified in this subsection (7)(B) if they can demonstrate that higher turbidity levels in individual filters are due to lime carryover only and not due to degraded filter performance.

   1. 1. Surface water systems that serve more

than ten thousand (10,000) people must report the individual filter turbidity measurement results within ten (10) days after the end of each month only if measurements demonstrate one (1) or more of the following conditions.

1. A. For any individual filter that has a

measured turbidity level of greater than 1.0 NTU in two (2) consecutive measurements taken fifteen (15) minutes apart, the system must report the filter number, the turbidity measurement, and the date(s) on which the exceedance occurred. In addition, the system must either produce a filter profile for the filter within seven (7) days of the exceedance (if the system is not able to identify an obvious reason for the abnormal filter performance) and report that the profile has been produced or report the obvious reason for the exceedance.

1. B. For any individual filter that has a

measured turbidity level of greater than 0.5 NTU in two (2) consecutive measurements taken fifteen (15) minutes apart at the end of the first four (4) hours of continuous filter operation after the filter has been backwashed or otherwise taken offline, the system must report the filter number, the turbidity, and the date(s) on which the exceedance occurred. In addition, the system must either produce a filter profile for the filter within seven (7) days of the exceedance (if the system is not able to identify an obvious reason for the abnormal filter performance) and report that the profile has been produced or report the obvious reason for the exceedance.

1. C. For any individual filter that has a

measured turbidity level of greater than 1.0 NTU in two (2) consecutive measurements taken fifteen (15) minutes apart at any time in each of three (3) consecutive months, the system must report the filter number, the turbidity measurement, and the date(s) on which the exceedance occurred. In addition, the system must conduct a self-assessment of the filter within fourteen (14) days of the exceedance and report that the self-assessment was conducted. The self-assessment must consist of at least the following components: assessment of filter performance; development of a filter profile; identification and prioritization of factors limiting filter performance; assessment of the applicability of corrections; and preparation of a filter selfassessment report.

1. D. For any individual filter that has a

measured turbidity level of greater than 2.0 NTU in two (2) consecutive measurements taken fifteen (15) minutes apart at any time in each of two (2) consecutive months, the system must report the filter number, the turbidity measurement, and the date(s) on which the exceedance occurred. In addition, the system must arrange for the conduct of a Comprehensive Performance Evaluation by the department or a third party approved by the department no later than thirty (30) days following the exceedance and have the evaluation completed and submitted to the department no later than ninety (90) days following the exceedance.

1. (I) The Comprehensive Perfor-

mance Evaluation is a thorough review and analysis of a treatment plant’s performancebased capabilities and associated administrative, operation and maintenance practices. It is conducted to identify factors that may be adversely impacting a plant’s capability to achieve compliance and emphasizes approaches that can be implemented without significant capital improvements. The comprehensive performance evaluation must consist of at least the following components: Assessment of plant performance; evaluation of major unit processes; identification and prioritization of performance limiting factors; assessment of the applicability of comprehensive technical assistance; and preparation of a Comprehensive Performance Evaluation report.

1. (II) If the Comprehensive Perfor-

mance Evaluation results indicate improved performance potential, the system shall implement Comprehensive Technical Assistance. The system must identify and systematically address plant-specific factors. The Comprehensive Technical Assistance is a combination of utilizing Comprehensive Performance Evaluation results as a basis for followup, implementing process control priority-setting techniques, and maintaining long-term involvement to systematically train staff and administrators.

1. 2. Surface water systems that serve less

than ten thousand (10,000) people must report the individual filter turbidity measurements within ten (10) days after the end of each month only if measurements demonstrate one (1) or more of the following conditions.

1. A. For any individual filter that

exceeds 1.0 NTU in two (2) consecutive recordings fifteen (15) minutes apart, the system must report the filter number(s), corresponding date(s), turbidity value(s) which exceeded 1.0 NTU, and the cause (if known) for the exceedance(s).

1. B. For any individual filter that for

three (3) months in a row the turbidity exceeded 1.0 NTU in two (2) consecutive recordings fifteen (15) minutes apart, the system must conduct a self-assessment of the filter(s) within fourteen (14) days of the triggering event. The system must report the date self-assessment was triggered and the date it was completed. The self-assessment must consist of at least the following components: assessment of filter performance; development of a filter profile; identification and prioritization of factors limiting filter performance; assessment of the applicability of corrections; and preparation of a filter selfassessment report. The filter self-assessment is not required if a comprehensive performance evaluation (CPE) was required.

1. C. For any individual filter that for

two (2) months in a row the turbidity exceeded 2.0 NTU in two (2) consecutive recordings, fifteen (15) minutes apart, the system must arrange to have a CPE conducted not later than sixty (60) days following the triggering event. The CPE must be conducted by the department or a third party approved by the department. If a CPE has been completed by the department or a third party approved by the department within the twelve (12) prior months or the system and department are jointly participating in an ongoing Comprehensive Technical Assistance (CTA) project at the system, a new CPE is not required. If conducted, a CPE must be completed and submitted to the department no later than one hundred twenty (120) days following the triggering event.

1. (C) Additional turbidity reporting requirements. Reporting requirements for turbidity exceedences are in 10 CSR 60-4.050(3).

1. (8) 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. (9) A supplier of water shall 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 for initial public notice and any repeat notices. The supplier of water shall provide a certification he/she has fully complied with the public notification regulations, and shall provide a representative copy of each type of notice distributed, published, posted, and made available to the persons served by the system and to the media.

AUTHORITY: section 640.100, RSMo Supp. 2002.* 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. Amended: Filed Dec. 15, 1999, effective Sept. 1, 2000. Amended: Filed March 17, 2003, effective Nov. 30, 2003. *Original authority: 640.100, RSMo 1939, amended 1978, 1981, 1982, 1988, 1989, 1992, 1993, 1995, 1996, 1998, 1999, 2002.