test your drinking water

Water. It comprises more than two-thirds of the weight of the human body and nearly 95 percent of your brain. You need it to live, and hopefully, you’re consuming between 2-3 liters of water a day. But if you are, what else are you drinking? What is in your well and what microscopic baddies have hitched a ride on your H2O? The DIY experts at Stack Exchangeoffer a few tips on spotting contaminents in your drinking water.


What are the best ways to test the water quality in my house?

Are there any products that can continuously test the water coming in?

— Originally asked by caseyboardman)

Answer: Call The Pros

“Water quality” is not one-dimensional … what kind of contaminats do you want to test for?

If the answer is either “everything” or “I don’t know” then start by finding a reputable local lab, describe your concerns to them, and see what they recommend based on their knowledge of the water in the area. Once you have done a thorough one-time test, you will have a basis for deciding what (if anything) to test for on an ongoing basis.

To find a lab, start by calling the water authorities in your town or surrounding towns. At least in my case, they were happy to recommend a local, independent lab.

Also see: “Should I test the water in my house for contamination?”

But beware: the kits are not terribly accurate, and they don’t test for all harmful contaminants. If there are very high levels of certain contaminants in your water, the kit very well may flag the problem. But don’t expect high accuracy or a guarantee that your water is safe.

The best bet if you are concerned about the quality of your water: Find a reputable, independent lab, which will provide accurate results and have no vested interest in selling you an expensive filtration system.

— Answered by woodchips

Answer: Common Contaminants…

There are MANY things that determine quality of water. A few common contaminants:

“Nuisance” Bacteria
– Not always harmful, but they do release iron and sulfur into the water during their life cycles, and form a biofilm on the well surfaces

Disease-causing bacteria
– Most common are e. coli and coliform, but also include fecal coliform and fecal streptococci among others
– You don’t want any of these in the water

– Yellow or orange color, may cause stains on laundry and fixtures, and may have a bitter taste
– See what you can do if your iron levels are too high

– Causes black or purple color in water and may stain fixtures, and cause a bitter taste

Hydrogen sulphide (sulfur)
– Smells like rotten eggs
– Can be naturally occurring, and sometimes caused by bacteria

Hard water
– Caused by calcium carbonate (salt)
– See what you should look for in a water softener

– Can be caused by leaded solder, and old brass plumbing components.
– A neurotoxin which is quite dangerous to drink

Sand or grit

Most jurisdictions have their own set of guidelines for acceptable levels of about a hundred different attributes (eg, here are the EPA contaminants limits, to my knowledge in North America, local standards are at or below these levels).

There are currently (to my knowledge, at least) no continuous processes for checking bacteria — though I do know of at least one company who has been working on it for commercial applications (I would guess it would cost upwards of $20k). There are some sensors that can monitor other attributes. Most are prohibitively expensive for a home.