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Water Quality Testing

In compliance with the Lead and Copper Rule, PWCSA analyzes water distributed to customers to assure that it is not corrosive. Corrosion control is needed to prevent dissolution of lead from lead solder in older homes and extend the life of household pipes. PWCSA water suppliers, Fairfax Water and the City of Manassas, add corrosion inhibitors that contain phosphate.

Click here for descriptions of water quality parameters explaining their relevance on corrosion control.

 

West Water System

Time Frame Collected Temperature, Degrees C pH Standard Units (Min-Max) Alkalinity, mg/L, Average Calcium, mg/L, Average Conductivity, umhos/cm, Average Phosphate, mg/L, Average
Jan-Jun 2017 17.2 6.72-7.73 62 28 291 1.31
Regulatory Limit No Limit, (N/L) Minimum 6.50 N/L N/L N/L N/L

 

East Water System

Time Frame Collected Temperature, Degrees C pH,Standard Units, (Min-Max) Alkalinity, mg/L, Average Calcium, mg/L, Average Conductivity, umhos/cm, Average Phosphate, mg/L, Average
Jan-Jun 2017 17.3 7.00-7.81 51 23 357 1.58
Regulatory Limit No Limit (N/L) Minimum 7.00 N/L N/L N/L Minimum 0.9

 

Bull Run Mountain and Evergreen Water System

Time Frame Collected Temperature, Degrees C pH,Standard Units (Min-Max) Alkalinity,mg/L, Average Calcium, mg/L, Average Conductivity, umhos/cm, Average
Jan-Jun 2017 13.3 5.85-7.86 77 7 176
Regulatory Limit No Limit (N/L) N/L N/L N/L N/L

 

Hoadly Manor Water System

Time Frame Collected Temperature, Degrees C pH,Standard Units (Min-Max) Alkalinity,mg/L, Average Calcium, mg/L, Average Conductivity, umhos/cm, Average
Jan-Jun 2017 13.7 6.75-7.73 65 45 457
Regulatory Limit No Limit (N/L) N/L N/L N/L N/L

 

Key to Corrosion Control Water Quality Parameters

Temperature is measured to put in perspective other parameters. Corrosion is normally higher at higher temperatures.  

pH measures how acidic or basic water is. Too acidic or too basic water is corrosive. Most living things need water to have a pH of about 7, which is neutral. Corrosive liquids decompose (or eat away) metals from pipes, faucets, etc.

Alkalinity is the ability of water to neutralize acids. The water distributed to your home has good levels of alkalinity to prevent corrosion of pipes and faucets.

Calcium is analyzed to determine how “hard” the water is. Calcium is a mineral that makes water hard.  Hard water is not a health issue but can be a problem because of mineral buildup on plumbing fixtures and poor soap or detergent performance.

Conductivity is used to monitor the consistency of quality from water purification processes which remove inorganic contaminants from water.

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