40 CFR 141.134  Reporting and recordkeeping requirements.
(a) Systems required to sample quarterly or more frequently must report to the State within 10 days after the end of each quarter in which samples were collected, notwithstanding the provisions of § 141.31. Systems required to sample less frequently than quarterly must report to the State within 10 days after the end of each monitoring period in which samples were collected.
(b) Disinfection byproducts. Systems must report the information specified in the following table:
If you are a * * *  You must report * * * 

(1) System monitoring for TTHMs and HAA5 under the requirements of § 141.132(b) on a quarterly or more frequent basis.  (i) The number of samples taken during the last quarter.
(ii) The location, date, and result of each sample taken during the last quarter. (iii) The arithmetic average of all samples taken in the last quarter. (iv) The annual arithmetic average of the quarterly arithmetic averages of this section for the last four quarters. (v) Whether, based on § 141.133(b)(1), the MCL was violated. 
(2) System monitoring for TTHMs and HAA5 under the requirements of § 141.132(b) less frequently than quarterly (but as least annually).  (i) The number of samples taken during the last year.
(ii) The location, date, and result of each sample taken during the last monitoring period. (iii) The arithmetic average of all samples taken over the last year. (iv) Whether, based on § 141.133(b)(1), the MCL was violated. 
(3) System monitoring for TTHMs and HAA5 under the requriements of § 141.132(b) less frequently than annually.  (i) The location, date, and result of each sample taken
(ii) Whether, based on § 141.133(b)(1), the MCL was violated. 
(4) System monitoring for chlorite under the requirements of § 141.132(b)  (i) The number of entry point samples taken each month for the last 3 months.
(ii) The location, date, and result of each sample (both entry point and distribution system) taken during the last quarter. (iii) For each month in the reporting period, the arithmetic average of all samples taken in each three samples set taken in the distribution system. (iv) Whether, based on § 141.133(b)(3), the MCL was violated, in which month, and how many times it was violated each month. 
(5) System monitoring for bromate under the requirements of § 141.132(b).  (i)The number of samples taken during the last quarter.
(ii)The location, date, and result of each sample taken during the last quarter. (iii) The arithmetic average of the monthly arithmetic averages of all samples taken in the last year. (iv) Whether, based on § 141.133(b)(2), the MCL was violated. 
1 The State may choose to perform calculations and determine whether the MCL was exceeded, in lieu of having the system report that information
(c) Disinfectants. Systems must report the information specified in the following table:
If you are a * * *  You must report * * * 

(1) System monitoring for chlorine or chloramines under the requirements of § 141.132(c)  (i) The number of samples taken during each month of the last quarter.
(ii) The month arithmetic average of all samples taken in each month for the last 12 months. (iii) The arithmetic average of the monthly averages for the last 12 months. (iv) Whether, based on § 141.133(c)(1), the MRD was violated. 
(2) System monitoring for chlorine dioxide under the requirements of § 141.132(c).  (i) The dates, result, and locations of samples taken during the last quarter.
(ii) Whether, based on § 141.133(c)(2), the MRDL was violated. (iii) Whether the MRDL was exceeded in any two consecutive daily samples and whether the resulting violation was acuate or nonacute. 
1 The State may choose to perform calculations and determine whether the MRDL was exceeded, in lieu of having the system report that information.
(d) Disinfection byproduct precursors and enhanced coagulation or enhanced softening. Systems must report the information specified in the following table:
If you are a. . .  You must report. . . ^{1} 

(1) System monitoring monthly or quarterly for TOC under the requirements of § 141.132(d) and required to meet the enhanced coagulation or enhanced softening requirements in § 141.135(b)(2) or (3)  (i) The number of paired (source water and treated water) samples taken during the last quarter.
(ii) The location, date, and results of each paired sample and associated alkalinity taken during the last quarter. (iii) 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. (iv) Calculations for determining compliance with the TOC percent removal requirements, as provided in § 141.135(c)(1). (v) Whether the system is in compliance with the enhanced coagulation or enhanced softening percent removal requirements in § 141.135(b) for the last four quarters. 
(2) System monitoring monthly or quarterly for TOC under the requirements of § 141.132(d) and meeting one or more of the alternative compliance criteria in § 141.135(a)(2) or (3)  (i) The alternative compliance criterion that the system is using. 
(ii) The number of paired samples taken during the last quarter.  
(iii) The location, date, and result of each paired sample and associated alkalinity taken during the last quarter.  
(iv) The running annual arithmetic average based on monthly averages (or quarterly samples) of source water TOC for systems meeting a criterion in §§ 141.135(a)(2)(i) or (iii) or of treated water TOC for systems meeting the criterion in § 141.135(a)(2)(ii).  
(v) The running annual arithmetic average based on monthly averages (or quarterly samples) of source water SUVA for systems meeting the criterion in § 141.135(a)(2)(v) or of treated water SUVA for systems meeting the criterion in § 141.135(a)(2)(vi).  
(vi) The running annual average of source water alkalinity for systems meeting the criterion in § 141.135(a)(2)(iii) and of treated water alkalinity for systems meeting the criterion in § 141.135(a)(3)(i).  
(vii) The running annual average for both TTHM and HAA5 for systems meeting the criterion in § 141.135(a)(2)(iii) or (iv).  
(viii) The running annual average of the amount of magnesium hardness removal (as CaCO 

(ix) Whether the system is in compliance with the particular alternative compliance criterion in § 141.135(a)(2) or (3). 
1 The State may choose to perform calculations and determine whether the treatment technique was met, in lieu of having the system report that information.