Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Disinfection of Domestic Water Systems
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## The scope includes building service mains downstream of the water service entrance, domestic cold-water and hot-water distribution piping, on-premise potable water storage tanks and hydropneumatic tanks, and all inline appurtenances filled with potable water for the first time. {note}
−## Disinfection is a commissioning activity, not a construction activity: the system must already be installed, pressure-tested, and proven leak-free under [[sync/domestic-water-piping]] before disinfection begins. {note}
+## Disinfection is a commissioning activity, not a construction activity: the system must already be installed, pressure-tested, and proven leak-free under [[sync/domestic-water-piping]] before disinfection begins.
## The most important boundary in this standard is the line between premise plumbing and the public distribution system. {note}
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step: 0.5
setpoints:
+ - 5
- 12.5
- 65
- 70
+ - 100
```
…50 unchanged lines
step: 5
setpoints:
+ - 25
- 50
- 200
+ - 300
default: 50
```
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- 3
- 24
+ - 48
default: 24
```
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step: 5
setpoints:
+ - 10
- 25
+ - 50
```
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step: 0.1
setpoints:
+ - 1
- 2.5
+ - 5
default: 2.5
```
…7 unchanged lines
step: 0.1
setpoints:
+ - 0.1
- 0.5
− - 1.0
+ - 1
```
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### A minimum of two separate samples shall be collected from each isolated system segment, taken at least 24 hours apart, or as the local health department requires, whichever is more stringent.
−### Samples shall be collected from representative points throughout the system, including the hydraulically remote end and any zone isolated during disinfection.
−
−### A single sample shall not be used to clear a multi-zone or large-volume system.
−
−### Samples shall be collected in sterile containers by the method required by the testing laboratory and delivered to the laboratory within its accepted holding time.
−
−### Sample holding time and the laboratory's hours of acceptance shall be coordinated in advance.
−
−### Weekend and holiday gaps in laboratory acceptance are a common cause of expired samples and re-sampling. {note}
−
```datasheet
label: Minimum Bacteriological Samples per Segment
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step: 1
setpoints:
+ - 1
- 2
+ - 6
```
+### Samples shall be collected from representative points throughout the system, including the hydraulically remote end and any zone isolated during disinfection.
+
+### A single sample shall not be used to clear a multi-zone or large-volume system.
+
+### Samples shall be collected in sterile containers by the method required by the testing laboratory and delivered to the laboratory within its accepted holding time.
+
```datasheet
label: Bacteriological Test Method
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```
+### Sample holding time and the laboratory's hours of acceptance shall be coordinated in advance.
+
+### Weekend and holiday gaps in laboratory acceptance are a common cause of expired samples and re-sampling. {note}
+
## Acceptance Criteria {toc}
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## Supply Water Chemistry {toc}
−### The normal residual carried by the supply must be known before the flush endpoint and the bacteriological sampling residual can be evaluated, because both criteria are expressed relative to the normal supply residual. {note}
+### The normal residual carried by the supply must be known before the flush endpoint and the bacteriological sampling residual can be evaluated, because both criteria are expressed relative to the normal supply residual.
### Where the finished water from the purveyor is chloraminated rather than free-chlorinated, the normal supply carries a combined-chlorine residual rather than a free-chlorine one, which shifts the baseline against which the flush endpoint is read (AWWA Manual M56). {note}
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## The disinfection records, laboratory reports, and statement of clearance shall be incorporated into the project commissioning record and the operation and maintenance documentation.