Ill. Admin. Code tit. 83, § 600.310 – Test and Allowable Error

a) The accuracy of a water meter shall be tested by comparing the actual amount of water passing through it with the amount indicated on the dial.

b) The test shall be conducted in accordance with the standards for testing Cold Water Meters as prescribed by the American Water Works Association (AWWA C705-60) with quantities and flows for positive displacement meters as follows:

TEST FLOWS (G.P.M.) & QUANTITY
	MINIMUM	INTERMEDIATE	MAXIMUM
Size of	Flow	QUANTITY	FLOW	QUANTITY	FLOW	QUANTITY
meter	G.P.M.	Gal.	Cu.Ft.	G.P.M.	Gal.	Cu.Ft.	G.P.M.	Gal.	Cu.Ft.
⅝"	¼	10	1	2	10	1	15	100	10
¾"	½	10	1	3	10	1	25	100	10
1"	¾	10	1	4	10	1	40	100	10
1½"	1½	100	10	8	100	10	80	1000	100
2"	2	100	10	15	100	10	120	1000	100
3"	4	100	10	20	100	10	250	1000	100
4"	7	100	10	40	100	10	350	1000	100
6"	12	100	10	60	100	10	700	1000	100

No meters shall be placed in service when the accuracy is different than follows:

	NEW METERS	REPAIRED METERS
MINIMUM RANGE	95-101.5%	90-101.5%
INTERMEDIATE RANGE	98.5-101.5%	98.5-101.5%
MAXIMUM RANGE	98.5-101.5%	98.5-101.5%

c) The utility may make such additional tests as it may deem necessary but in a manner that will not unreasonably inconvenience the customer.