Kan. Admin. Regs. § 28-15a-21 – Coliform sampling.

Each person that operates a public water supply system shall comply with the following monitoring and analytical requirements for coliforms:

(a) The sampling period for microbiological compliance shall be one calendar month for all public water supply systems.
(b) If a person that operates a public water supply system collecting fewer than five routine samples per month has at least one total coliform-positive sample and the department does not invalidate any of the samples, the person shall collect at least five routine samples during the next month the person provides water to the public, unless directed otherwise by the department.
1. (cv) (1) Each person that operates a public water supply system that uses surface water as its source of supply and serves a population of 4,100 or less shall take at least four water samples during each sampling period.
  1. (2) Each person that operates a public water supply system that uses surface water as its source of supply and serves a population greater than 4,100 shall take water samples according to the table in subsection (d).
  2. (3) Each person that operates a public water supply system that uses groundwater, not including groundwater under direct influence of surface water, as its source of supply and each person that operates a public water supply system that purchases water from another public water supply system shall take water samples according to the table in subsection (d).
(d) Each person that operates a public water supply system shall ensure that routine samples are collected at regular time intervals and analyzed for total coliform bacteria as specified in the following table:

Population Served	Minimum number of samples per sampling period
25 to 2,500	2
2,501 to 3,300	3
3,301 to 4,100	4
4,101 to 4,900	5
4,901 to 5,800	6
5,801 to 6,700	7
6,701 to 7,600	8
7,601 to 8,500	9
8,501 to 12,900	10
12,901 to 17,200	15
17,201 to 21,500	20
21,501 to 25,000	25
25,001 to 33,000	30
33,001 to 41,000	40
41,001 to 50,000	50
50,001 to 59,000	60
59,001 to 70,000	70
70,001 to 83,000	80
83,001 to 96,000	90
96,001 to 130,000	100
130,001 to 220,000	120
220,001 to 320,000	150
320,001 to 450,000	180

For each additional 150,000 in population, an additional 30 water samples shall be analyzed for each sampling period.

(Authorized by and implementing K.S.A. 65-171m; effective Oct. 1, 2004; amended June 7, 2018.)