Water results for Coquitlam

Metro Vancouver lists Coquitlam among its water-supply member jurisdictions. The tables separate the regional sources; supply routing and blending can change, so no single plant result is assigned to every address.

Understanding your local water

Where your water comes from

Read the utility report ↗

Hardness and everyday use

The treated-source hardness results are low. A softener is not the starting recommendation for a home on this regional supply. If you see deposits, identify their cause and confirm your water source first.

Read the utility report ↗

Chlorine, taste and filtration

The upstream utility uses chlorine for disinfection. If your goal is to improve taste or odour, compare filtration with a specific chlorine-reduction claim and a suitable flow rating. A water softener addresses hardness; it does not replace that filtration stage.

Read the utility report ↗

Reading the public results

These records give Coquitlam residents a way to investigate their supplier’s water. Keep the sample location, date, units and result type together when comparing numbers. Local distribution conditions, plumbing and private wells require separate assessment.

Local water information

Published water results
for Coquitlam.

Capilano water system · Regional supply

2025 annual averages and treated-water ranges

Regional supply results from the named water system. Source blending and operating conditions vary. These are regional supply statistics, not Vancouver neighbourhood or household samples. Regional context for Coquitlam: these are the named supplier’s results, not local tap samples.

Greater Vancouver Water District · Capilano · report page 37
Parameter	Unit	Untreated average	Treated average	Treated range
Alkalinity as CaCO3	mg/L	3.1	21	17-23
Aluminum Dissolved	µg/L	64	25	17-37
Aluminum Total	µg/L	109	28	18-50
Antimony Total	µg/L	<0.5	<0.5	<0.5
Arsenic Total	µg/L	<0.5	<0.5	<0.5
Barium Total	µg/L	2.6	3.0	2.6 - 3.4
Boron Total	µg/L	<10	<10	<10
Bromate	µg/L	<10	<10	<10
Bromide	µg/L	<10	<10	<10
Cadmium Total	µg/L	<0.2	<0.2	<0.2
Calcium Total	µg/L	1,180	7,910	7,180 - 8,880
Carbon Organic - Dissolved	mg/L	1.7	0.7	0.5-1.1
Carbon Organic - Total	mg/L	1.8	0.7	0.5-1.1
Chlorate	µg/L	<10	42	20-110
Chloride	mg/L	<0.6	2.7	2.4 - 3.5
Chromium Total	µg/L	<0.07	<0.05	<0.05 - 0.06
Cobalt Total	µg/L	<0.5	<0.5	<0.5
Colour - Apparent	ACU	14	<2	<2-2
Colour - True	TCU	10	<1	<1 - 1
Conductivity	µmhos/cm	11	52	47 - 58
Copper Total	µg/L	3.0	<0.5	<0.5
Cyanide Total	mg/L	<0.002	<0.002	<0.002
Cyanobacterial Toxins – Microcystin – LR	µg/L	<0.20	N/A	N/A
1,4-Dioxane	µg/L	<1	N/A	N/A
Formaldehyde	µg/L	N/A4	N/A4	N/A4
Fluoride	mg/L	<0.05	<0.05	<0.05
Haloacetic Acid 5 (HAA5)	µg/L	<3	16	10 - 20
Hardness as CaCO3	mg/L	3.6	20.5	18.8 - 22.2
Iron Dissolved	µg/L	30	<5	<5
Iron Total	µg/L	89	<8	<5-15
Lead Total	µg/L	<0.5	<0.5	<0.5
Magnesium Total	µg/L	164	216	157 - 296
Manganese Dissolved	µg/L	3.7	2.0	0.9 - 4.1
Manganese Total	µg/L	4.6	4.2	2.0 - 10.2
Mercury Total	µg/L	<0.05	<0.05	<0.05
Molybdenum Total	µg/L	<0.5	<0.5	<0.5
Nickel Total	µg/L	<0.5	<0.5	<0.5
Nitrilotriacetic acid (NTA)	µg/L	<50	N/A	N/A
Nitrogen - Ammonia as N	mg/L	<0.02	<0.02	<0.02
Nitrogen - Nitrate as N	mg/L	0.07	0.06	0.02 - 0.09
Nitrogen - Nitrite as N	mg/L	<0.01	<0.01	<0.01
N-Nitrosodimethylamine (NDMA)	ng/L	<1.9	N/A	N/A
pH	pH units	6.6	8.3	7.9 - 8.5
Phenol	mg/L	<0.004	<0.004	<0.002 - <0.005
Potassium Total	µg/L	156	154	140 - 166
Residue Total Dissolved (TDS)	mg/L	14	32	28 - 37
Selenium Total	µg/L	<0.5	<0.5	<0.5
Silica as SiO2	mg/L	3.5	3.5	3.2 - 3.8
Silver Total	µg/L	<0.5	<0.5	<0.5
Sodium Total	µg/L	575	1,660	1,340 - 2,120
Strontium	µg/L	5.7	21.5	20.5 – 22.4
Total Trihalomethanes (TTHM)	µg/L	<4	22.5	19 - 26
Turbidity	NTU	0.93	0.15	0.07 - 0.40
Uranium Total	µg/L	<0.5	<0.5	<0.5
UV Absorbance 254 nm	Abs/cm	0.067	0.011	0.007 - 0.015
Zinc Total	µg/L	<3	<3	<3

Total and dissolved metal measurements are different tests and are retained as separate rows. Follow the current notice for your own water supplier. N/A means not applicable or not available as described in the source. A superscript reference rendered beside N/A points to the original footnote; it is not a measurement. All physical and chemical analytes in this source table are included.

Metro Vancouver · Original 2025 annual report ↗

Seymour water system · Regional supply

2025 annual averages and treated-water ranges

Greater Vancouver Water District · Seymour · report page 38
Parameter	Unit	Untreated average	Treated average	Treated range
Alkalinity as CaCO3	mg/L	4.1	20	17 - 23
Aluminum Dissolved	µg/L	49	25	15 - 37
Aluminum Total	µg/L	76	28	16 - 48
Antimony Total	µg/L	<0.5	<0.5	<0.5
Arsenic Total	µg/L	<0.5	<0.5	<0.5
Barium Total	µg/L	3.4	2.8	2.4 - 3.0
Boron Total	µg/L	<10	<10	<10
Bromate	µg/L	<10	<10	<10
Bromide	µg/L	<10	<10	<10
Cadmium Total	µg/L	<0.2	<0.2	<0.2
Calcium Total	µg/L	1,670	7,810	6,930 - 8,760
Carbon Organic - Dissolved	mg/L	1.6	0.7	0.5 - 1.0
Carbon Organic - Total	mg/L	1.6	0.7	0.5 - 1.0
Chlorate	µg/L	<10	43	20 - 110
Chloride	mg/L	<0.5	2.8	2.3 - 3.5
Chromium Total	µg/L	<0.05	<0.05	<0.05
Cobalt Total	µg/L	<0.5	<0.5	<0.5
Colour - Apparent	ACU	14	<2	<2 - 3
Colour - True	TCU	9	<1	<1 - 1
Conductivity	µmhos/cm	14	52	47 - 56
Copper Total	µg/L	24.9	<0.5	<0.5
Cyanide Total	mg/L	<0.002	<0.002	<0.002
Cyanobacterial Toxins – Microcystin – LR	µg/L	<0.20	N/A	N/A
1,4-Dioxane	µg/L	<1	<1	<1
Formaldehyde	µg/L	N/A4	N/A4	N/A4
Fluoride	mg/L	<0.05	<0.05	<0.05
Haloacetic Acid 5 (HAA5)	µg/L	<3	12	9 - 14
Hardness as CaCO3	mg/L	4.8	20.2	18.1 - 22.1
Iron Dissolved	µg/L	59	<5	<5
Iron Total	µg/L	147	<9	<5 - 20
Lead Total	µg/L	<0.5	<0.5	<0.5
Magnesium Total	µg/L	147	213	154 - 302
Manganese Dissolved	µg/L	4.1	2.6	0.9 - 5.6
Manganese Total	µg/L	5.8	4.6	2.4 - 10.6
Mercury Total	µg/L	<0.05	<0.05	<0.05
Molybdenum Total	µg/L	<0.5	<0.5	<0.5
Nickel Total	µg/L	<0.5	<0.5	<0.5
Nitrilotriacetic acid (NTA)	µg/L	<50	<50	<50
Nitrogen - Ammonia as N	mg/L	<0.02	<0.02	<0.02
Nitrogen - Nitrate as N	mg/L	0.05	0.06	0.02 - 0.09
Nitrogen - Nitrite as N	mg/L	<0.01	<0.01	<0.01
N-Nitrosodimethylamine (NDMA)	ng/L	<1.9	<1.9	<1.9
pH	pH units	6.6	8.1	7.8 - 8.5
Phenol	mg/L	<0.004	<0.004	<0.002 - <0.005
Potassium Total	µg/L	156	149	127 - 165
Residue Total Dissolved (TDS)	mg/L	15	32	29 - 37
Selenium Total	µg/L	<0.5	<0.5	<0.5
Silica as SiO2	mg/L	3.4	3.5	3.1 - 3.8
Silver Total	µg/L	<0.5	<0.5	<0.5
Sodium Total	µg/L	554	1650	1,310 - 2,100
Strontium	µg/L	7.2	20.4	18.6 – 21.8
Total Trihalomethanes (TTHM)	µg/L	<4	18.5	15 - 20
Turbidity	NTU	0.56	0.17	0.08 - 0.52
Uranium Total	µg/L	<0.5	<0.5	<0.5
UV Absorbance 254 nm	Abs/cm	0.061	0.011	0.007 - 0.016
Zinc Total	µg/L	<3	<3	<3

Metro Vancouver · Original 2025 annual report ↗

Coquitlam water system · Regional supply

2025 annual averages and treated-water ranges

Greater Vancouver Water District · Coquitlam · report page 39
Parameter	Unit	Untreated average	Treated average	Treated range
Alkalinity as CaCO3	mg/L	1.9	20	9.5 - 23
Aluminum Dissolved	µg/L	55	61	44 - 74
Aluminum Total	µg/L	74	75	58 - 85
Antimony Total	µg/L	<0.5	<0.5	<0.5
Arsenic Total	µg/L	<0.5	<0.5	<0.5
Barium Total	µg/L	2.6	2.4	2.2 - 2.7
Boron Total	µg/L	<10	<10	<10
Bromate	µg/L	<10	<10	<10
Bromide	µg/L	<10	<10	<10
Cadmium Total	µg/L	<0.2	<0.2	<0.2
Calcium Total	µg/L	828	824	738 - 914
Carbon Organic - Dissolved	mg/L	1.6	1.6	1.3 - 2.1
Carbon Organic - Total	mg/L	1.7	1.6	1.3 - 2.1
Chlorate	µg/L	<10	110	45 - 160
Chloride	mg/L	<0.5	2.3	2.0 - 2.7
Chromium Total	µg/L	<0.05	<0.05	<0.05
Cobalt Total	µg/L	<0.5	<0.5	<0.5
Colour - Apparent	ACU	12	<2	<2 - 2
Colour - True	TCU	8	<1	<1 - 2
Conductivity	µmhos/cm	8	48	31 - 53
Copper Total	µg/L	<0.5	<0.5	<0.5
Cyanide Total	mg/L	<0.002	<0.002	<0.002
Cyanobacterial Toxins – Microcystin – LR	µg/L	<0.20	N/A	N/A
1,4-Dioxane	µg/L	<1	<1	<1
Formaldehyde	µg/L	N/A	19	19
Fluoride	mg/L	<0.05	<0.05	<0.05
Haloacetic Acid 5 (HAA5)	µg/L	<3	7	5 - 10
Hardness as CaCO3	mg/L	2.4	2.4	2.2 - 2.7
Iron Dissolved	µg/L	15	17	10 - 29
Iron Total	µg/L	44	43	28 - 97
Lead Total	µg/L	<0.5	<0.5	<0.5
Magnesium Total	µg/L	92	92	80 - 102
Manganese Dissolved	µg/L	3.4	2.4	0.8 - 3.5
Manganese Total	µg/L	3.8	3.2	2.2 - 4.2
Mercury Total	µg/L	<0.05	<0.05	<0.05
Molybdenum Total	µg/L	<0.5	<0.5	<0.5
Nickel Total	µg/L	<0.5	<0.5	<0.5
Nitrilotriacetic acid (NTA)	µg /L	<50	<50	<50
Nitrogen - Ammonia as N	mg/L	<0.02	<0.02	<0.02
Nitrogen - Nitrate as N	mg/L	0.07	0.07	0.05 - 0.09
Nitrogen - Nitrite as N	mg/L	<0.01	<0.01	<0.01
N-Nitrosodimethylamine (NDMA)	ng/L	<1.9	<1.9	<1.9
pH	pH units	6.3	8.3	7.7 - 9.2
Phenol	mg/L	<0.004	<0.004	<0.002 - <0.005
Potassium Total	µg/L	115	114	104 - 122
Residue Total Dissolved (TDS)	mg/L	11	33	30 - 35
Selenium Total	µg/L	<0.5	<0.5	<0.5
Silica as SiO2	mg/L	2.6	2.6	2.5 - 2.8
Silver Total	µg/L	<0.5	<0.5	<0.5
Sodium Total	µg/L	463	10,100	8,910 - 11,200
Strontium	µg/L	3.8	3.8	3.5 – 4.0
Total Trihalomethanes (TTHM)	µg/L	<4	5.5	4 - 7
Turbidity	NTU	0.39	0.33	0.13 - 2.0
Uranium Total	µg/L	<0.5	<0.5	<0.5
UV Absorbance 254 nm	Abs/cm	0.060	0.018	0.015 - 0.031
Zinc Total	µg/L	<3	<3	<3

Metro Vancouver · Original 2025 annual report ↗

These are dated public results for the locations shown, not a current test of your home. “<” means below the stated reporting limit, not zero. The linked reports contain the full results and laboratory notes. Sources checked September 13, 2026. Follow your supplier’s current notices and advisories.

Water questions in Coquitlam

Are these samples from my home in Coquitlam?

No. The location in each table identifies where the utility sampled. Regional results provide context for a connected home, but do not establish the result at your tap.

Which treatment should I consider?

What if my property uses a private well?

Confirm the source before using these tables. A private well needs its own water analysis; regional municipal results do not describe it.

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Water results for Coquitlam

Where your water comes from

Hardness and everyday use

Chlorine, taste and filtration

Reading the public results

Published water resultsfor Coquitlam.

Water questions in Coquitlam

Understand the waterat your own taps.

Published water results
for Coquitlam.

Understand the water
at your own taps.