WATER QUALITY MONITORING

Water quality samples are taken daily at the source and after treatment and analyzed to confirm compliance with applicable Interior Health Condition of Permit requirements. Weekly bacteriological samples are taken from a rotating location within the distribution system and submitted to ALS Environmental Accredited Laboratories for independent analysis. These weekly samples are also analyzed in house for free and total chlorine and turbidity.

RWWD personnel also sample the treated water daily for bacteriological analysis using IDEXX Colilert Test. Colilert simultaneously detects total coliforms and e. coli in water. All daily water samples taken and analyzed using the Colilert as an early result interpretation measure of current conditions.

Potable Water Disinfection By-Products

Under the Interior Health Authority recommendation, we sample our distribution system quarterly for THM’s, HAA’s and Total Organic Carbon. This analysis is performed by ALS Environmental accredited lab.

Raw Water Analysis

Water quality analysis is conducted twice per year during spring freshet and early fall conditions on the source water as recommended by Interior Health permit conditions. This analysis is performed by ALS Environmental accredited Laboratories.

Source Water	Frequency	In House	Accredited Lab
Temperature	Daily	X
pH	Daily	X
NTU	Daily	X
UVT	Daily	X
Iron, Total	Weekly	X
Full Chemical Analysis	Freshet & Fall		X

 

Treated Water	Frequency	In House	Accredited Lab
Bacteriological	Daily	X
Temperature	Daily	X
pH	Daily	X
NTU	Daily	X
Iron, Total	Weekly	X
Aluminum, Al3+	Weekly	X
UVT	Daily	X
UV Dose	Daily	X
UV Intensities	Daily	X

 

Distribution	Frequency	In House	Accredited Lab
Bacteriological	Weekly	X	X
Chlorine Residual	Weekly	X
NTU	Weekly	X
THM's	Quarterly		X
HAA's	Quarterly		X
TOC	Quarterly		X

 

DISTRIBUTION SAMPLING LOCATIONS:

• Old Yellowhead Highway (Frontage Road) South
• Old Yellowhead Highway (Frontage Road) North
• Hyas Place
• Reighmount Place
• Reighmount Drive
• Rayleigh Elementary School
• Davie Road
• Strawberry Lane
• Pinantan Place

Test Description	2021 - Results	Unit of	GCDWQ	Aesthetic
	Date	Date	Measure	MAC	Objective
Physical Tests
Colour			CU		15
Conductivity			µS/cm
Hardness (as CaCO3)			mg/L		500
pH			pH		7-10.5
Total Suspended Solids			mg/L
Total Dissolved Solids			mg/L		500
Turbidity			NTU
Anions and Nutrients
Alkalinity, Total (as CaCO3)			mg/L
Chloride (Cl)			mg/L		250
Flouride (F)			mg/L	1.5
Nitrate (as N)			mg/L	10
Nitrite (as N)			mg/L	1
Sulfate (SO4)			mg/L		500
Organic / Inorganic Carbon
Total Organic Carbon			mg/L
Total Metals
Aluminum (Al) - Total			mg/L		0.1
Antimony (Sb) - Total			mg/L	0.006
Arsenic (As) - Total			mg/L	0.01
Barium (Ba) - Total			mg/L	1
Boron (B) - Total			mg/L	5
Cadmium (Cd) - Total			mg/L	0.005
Calcium (Ca) - Total			mg/L
Chromium (Cr) - Total			mg/L	0.05
Copper (Cu) - Total			mg/L	2.0	1.0
Iron (Fe) - Total			mg/L		0.3
Lead (Pb) - Total			mg/L	0.005
Magnesium (Mg) - Total			mg/L
Manganese (Mn) - Total			mg/L	0.12	0.02
Mercury (Hg) - Total			mg/L	0.001
Potassium (K) - Total			mg/L
Selenium (Se) - Total			mg/L	0.05
Sodium (Na) - Total			mg/L		200
Uranium (U) - Total			mg/L	0.02
Zinc (Zn) - Total			mg/L		5.0
Dissolved Metals
Aluminum (Al) - Dissolved			mg/L		0.1
Antimony (Sb) - Total			mg/L	0.006
Arsenic (As) - Dissolved			mg/L	0.01
Barium (Ba) - Dissolved			mg/L	1
Beryllium (Be ) - Dissolved
Bismuth (Bi) - Dissolved
Boron (B) - Dissolved			mg/L	5
Cadmium (Cd) - Dissolved			mg/L	0.005
Calcium (Ca) - Dissolved			mg/L
Cesium (Cs) - Dissolved
Chromium (Cr) - Dissolved			mg/L	0.05
Cobalt (Co) - Dissolved
Copper (Cu) - Dissolved			mg/L	2.0	1.0
Iron (Fe) - Dissolved			mg/L		0.3
Lead (Pb) - Dissolved			mg/L	0.005
Lithium (Li) - Dissolved
Magnesium (Mg) - Dissolved			mg/L
Manganese (Mn) - Dissolved			mg/L	0.12	0.02
Mercury (Hg) - Dissolved			mg/L	0.001
Molybdenum (mo) - Dissolved
Nickel (Ni) - Dissolved
Phosphorus (P) - Dissolved
Potassium (K) - Dissolved			mg/L
Rubidium (Rb) - Dissolved
Selenium (Se) - Dissolved			mg/L	0.05
Silicon (Si) - Dissolved
Silver (Ag) - Dissolved
Sodium (Na) - Dissolved			mg/L		200
Strontium (Sr) - Dissolved			mg/L
Sulfur (S) - Dissolved
Tellurium (Te) - Dissolved
Thallium (Tl) - Dissolved
Thorium (Th) - Thorium
Tin (Sn) - Dissolved
Titanium (Ti) - Dissolved
Tungsten (W) - Dissolved
Uranium (U) - Dissolved			mg/L	0.02
Vanadium (V) - Dissolved
Zinc (Zn) - Dissolved			mg/L		5.0
Zirconium (Zr) - Dissolved
GCDWQ = Guidelines for Canadian Drinking Water Quality limits updated annually
MAC - Maximum Allowable Concentration
*GCDWQ for Nitrate + Nitrite-N is the limit for nitrate only. If present as Nitrate, then the limit is 10 mg/L
< or N.D. = less than detection limit
- A blank entry designates no known limit

 

View printable version: Rayleigh Waterworks District Full Parameters