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This rule establishes microbiological standards and related monitoring requirements for all community and noncommunity water systems.
Bacteriological Sampling Procedure
- Select a representative sampling point. Make sure the faucet and tap are clean. There should be no attachments on the faucet or tap.
- Flame or bleach the tap using a propane torch or bleach (optional - based on system's knowledge and standard practices).
- Run water a minimum of 5 minutes, or for time specified in sampling site plan, to flush line for fresh sample.
- Remove cap from sample bottle. Do not touch lip of bottle or inside of cap.
- Fill bottle to the neck, leaving an air space at the top.
- Recap bottle and secure cap tightly.
- Complete laboratory form.
- Submit sample to laboratory immediately. Testing must be performed within 24 hours of sampling.
Total Coliform Monitoring Frequency for Community Water Supplies
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Population Served
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Minimum Number of Samples Per Month
|
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25 to 1,001
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1
|
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1,001 to 2,500
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2
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2,501 to 3,300
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3
|
|
3,301 to 4,100
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4
|
|
4,101 to 4,900
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5
|
|
4,901 to 5,800
|
6
|
|
5,801 to 6,700
|
7
|
|
6,701 to 7,600
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8
|
|
7,601 to 8,500
|
9
|
|
8,501 to 12,900
|
10
|
|
12,901 to 17,200
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15
|
|
17,201 to 21,500
|
20
|
|
21,501 to 25,000
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25
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|
25,001 to 33,000
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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
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|
220,001 to 320,000
|
150
|
|
320,001 to 450,000
|
180
|
|
450,001 to 600,000
|
210
|
|
600,001 to 780,000
|
240
|
|
780,001 to 970,000
|
270
|
|
970,001 to 1,230,000
|
300
|
|
1,230,001 to 1,520,000
|
330
|
|
1,520,001 to 1,850,000
|
360
|
|
1,850,001 to 2,270,000
|
390
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|
2,270,001 to 3,020,000
|
420
|
|
3,020,001 to 3,960,000
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450
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3,960,001 or more
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480
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