Drinking Water Quality Confirmation   1 comment

One of the tasks recommended in The Complete Organic Pregnancy to do before getting pregnant is to have your water tested. For city dwellers served by a community water system the primary concern, unless you have taste and odor problems, is lead. I, however, had made the decision that I didn’t think it was worthwhile. I read the annual Consumer Confidence Reports produced by my water agency, and so I know that there aren’t any major concerns with the tap water that I receive relative to drinking water regulations. The concern for lead in water is due to leaching from pipes. Since we live in a house that was built in 1979, I’m not worried about old lead pipes anywhere in my tap water distribution system. Hence, feeling that there just wasn’t enough reason to pay for a tap water test. Then I actually got pregnant, and had a very strong fear about being wrong in my assumption. Considering how much unfiltered tap water I drink (that’s all I drink at home), it could add up to a not-insignificant exposure of my unborn baby to lead. So we had our water tested.

I feel lucky that I’m an environmental engineer and so to some degree this is what I do for a living, because I found that there’s just no good detailed information available online for typical laypeople. There’s a circular string of links talking about testing your tap water for lead without ever describing HOW to do so. Everybody just links to the EPA drinking water pages, which could certainly be more complete. The lab where we got our bottles did provide a one sheet printout describing what to do, and confirming that the sampling method I planned to use was correct. I’m not even sure how an average homeowner would find a lab; I used a local lab that I have used for work, and that is certified under the state laboratory certification program. For lead we wanted a first flush sample: the water that first comes out of the pipes after sitting for several hours. So first thing in the morning I turned on the kitchen cold water tap, let the water run for a few seconds and then filled my bottles. I put them in a box with ice and delivered them to the lab on the way to work. We sampled the kitchen tap because we really don’t ingest much water from the bathroom taps, and we only sampled cold water because we only use cold water for drinking and cooking (to avoid increased risk of contamination in hot water from pipe leaching or crud in the water heater). First flush samples are a worst case scenario for lead and copper because there is more time for leaching from the pipes. To be thorough we could have tested all three sinks, collected samples after the water had been running for a while in addition to first flush, and collected both cold and hot water; but that would have really been overkill.

And the results are (drumroll, please): good! Lead was not detected at the laboratory reporting limit (the lowest level at which the instruments can reliably detect and measure the concentration). Copper was detected at 88 parts per billion, relative to the EPA’s level for no adverse health effects of 1,300 parts per billion.

I also had our water tested for disinfection by-products, compounds like chloroform and dichloroacetic acid that are created in the process of drinking water disinfection (usually by chlorine), for my own curiosity. Again, our results were good with no compounds detected above the laboratory reporting limits. I did not test for chlorine itself because I know that there is a residual concentration in tap water. Water agencies are required to maintain a chlorine residual in order to ensure that the water stays disinfected all the way to the tap. I already have a chlorine-removing filter on our showerhead so that we’re not breathing massive amounts of chlorine while showering, and I’m not so concerned about chlorine right now that I want to deal with the hassle of filtering our water. Maybe some day I’ll collect a couple samples to confirm that the chlorine filter in the shower really works, but today I choose to stick my head in the sand at the possibility of exaggerated marketing.

Advertisements

Posted August 30, 2012 by mayakey in environment, home, pregnancy, water use

Tagged with ,

One response to “Drinking Water Quality Confirmation

Subscribe to comments with RSS.

  1. Good drinking water is so important and so scarce in our world! Thanks for the great post! ~Lindsey

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: