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Document ID ca-gcdwqgtd-2016-01-12-5 Title Guidelines for Canadian Drinking Water Quality: Guideline Technical Document – Ammonia URL https://www.canada.ca/en/health-canada/services/publications/healthy-living/guidelines-canadian-drinking-water-quality-guideline-technical-document-ammonia/page-5-guidelines-canadian-drinking-water-quality-guideline-technical-document-ammonia.html Jurisdiction /ca Subdomain(s) Drinking water, Water treatment Language en Status completed Analyzed at 2026-03-17 15:11:13.720509+00:00 Relevance Technical guidance on ammonia in drinking water treatment and distribution.

3 Qualitative 10 Quantitative 0 Definitions

Q Qualitative Requirements (3)

Req ID	Category	Intent	Legal Status	Name	Subdomain(s)	Context	Conditions	Confidence
#Q001	treatment	treatment	guidance	Use of ammonia for chloramination	drinking water	Ammonia may also be added to treated water as part of the disinfection strategy to form chloramines as a secondary disinfectant.	When used as part of the disinfection strategy to form chloramines as a secondary disinfectant	high
#Q002	treatment	treatment	guidance	pH adjustment for ammonia form control	drinking water	A pH adjustment can be used to influence the form of ammonia in the water (Department of National Health and Welfare, 1993).		medium
#Q003	operational	operational	recommended	Accounting for source water ammonia concentration	drinking water	It is important to account for the ammonia concentration in the source water when establishing the ammonia dosage for chloramination (Muylwyk, 2009; Shorney-Darby and Harms, 2010).	When establishing the ammonia dosage for chloramination	high

P Quantitative Requirements (10)

Req ID	Category	Intent	Legal Status	Name	Subdomain(s)	Limit Type	Limit Value	Context	Conditions	Confidence
#P001	physical	aesthetic	unknown	Ammonia odour threshold	drinking water	unknown	1.5 mg/L	The odour threshold is 1.5 mg/L in water	in water	high
#P002	physical	operational	guideline	Ammonia Molecular mass	drinking water	requirement	17.03 g/mol	Physicochemical properties of ammonia		high
#P003	physical	operational	guideline	Ammonia Solubility	drinking water	requirement	421 g/L	Physicochemical properties of ammonia	at 20ºC	high
#P004	physical	operational	guideline	Ammonia Boiling point	drinking water	requirement	-33.4 ºC	Physicochemical properties of ammonia		high
#P005	physical	operational	guideline	Ammonia Melting point	drinking water	requirement	-77.7 ºC	Physicochemical properties of ammonia		high
#P006	physical	operational	guideline	Ammonia Vapour pressure	drinking water	requirement	882 kPa	Physicochemical properties of ammonia	at 20ºC	high
#P007	physical	operational	guideline	Ammonia Water solubility (0ºC)	drinking water	requirement	47 %	Physicochemical properties of ammonia	at 0ºC	high
#P008	physical	operational	guideline	Ammonia Water solubility (25ºC)	drinking water	requirement	31 %	Physicochemical properties of ammonia	at 25ºC	high
#P009	physical	operational	guideline	Ammonia Henry's law constant (Kaw)	drinking water	requirement	0.0006 dimensionless	Physicochemical properties of ammonia	at 20ºC	high
#P010	chemical	operational	guidance	Ammonia/Ammonium equilibrium pH	drinking water	unknown	9.3 pH	At 20°C, the ammonium ion predominates in drinking water below 9.3, whereas ammonia is mainly found at or above pH 9.3	at 20°C	high

D Definitions (0)

No definitions.