(a) All waterworks corporations under the jurisdiction of the Public Service Commission shall install approved meters and approved accessories, and before placing in service, test all water meters used for the purpose of billing customers, and shall adjust the same so that the registration on the meter dial shall indicate the quantity of water actually passing through the meter within the limits herein provided. However, meters and accessories placed in the field prior to the effective date of the approval regulations will be grandfathered, based on a review of the accuracy and reliability performance data supplied by waterworks corporations as directed by commission staff. Such application must be submitted within six months of the effective date of this section.

1. (1) No waterworks corporation furnishing metered water service shall allow a meter to remain in service for a period longer than that specified in the following table without checking or testing said meter for accuracy and making the necessary readjustments if found to be incorrect beyond the limits herein provided. In the case of new model water meters, the company shall test a sample of the meters after they have been in service for five years. The size of the sample shall be 10 percent of the total meters of that model in service for five years or, alternatively, any percentage which the company can demonstrate is statistically valid. When the test results have proven satisfactory for three consecutive years, the sampling of these meters may be discontinued.

   Size of meter	Interval between test
   ⅝ -inch, ¾ -inch	15 years
   1-inch	5 years
   1 ½ -inch, 2-inch	4 years
   3-inch	3 years
   4-inch	2 years
   6-inch and larger	1 year

2. (2) Nor shall any meter be permitted to remain in service without similarly checking for accuracy and readjusting when its registration since the last test exceeds the following: provided, however, that such routine tests shall not be required more often than once a year.

   Size	Interval between test registration
   ⅝ -inch	1,500,000 gallons
   ¾ -inch, 1-inch	2,000,000 gallons
   1 ½ -inch	3,000,000 gallons
   2-inch	7,000,000 gallons

(b)

(d) A complete record shall be kept by each waterworks corporation of all tests made by it to include:

1. (1) owning or serving company's number;
2. (2) manufacturer's name and number;
3. (3) type and rated capacity;
4. (4) date of installation, removal, and test;
5. (5) reason for test;
6. (6) history of meter; to include date of purchase, various places of installation with dates of installation and removal and reason for such removal; and
7. (7) date of test; to include meter readings, measurement of water passed, method of measurement, location of test whether on premises of customer, in laboratory or shop or elsewhere, and any other pertinent information.