High nitrates out of the tap - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 02-22-2013, 01:33 AM Thread Starter
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High nitrates out of the tap

My nitrates out of the tap consistently test between 10-20 ppm with the API drop tests. I realize they are not the most accurate tests out there, but I have tested water from other municipalities and they have tested below 5 ppm.

I have contacted the water department and they said that nitrates always leave the plant less than 5 ppm, and that it was likely an inaccurate test kit or "something in the water matrix interfering with the test method".


Could there be something between the plant and my faucet that raises the nitrates?

Could there be something in the water matrix causing a false positive?
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post #2 of 4 (permalink) Old 02-22-2013, 03:31 AM
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Hi, hoppy has a good sticky on calibrating test kits under water and parameters you could check that out and see if it helps. Other than that I don't know what to tell you.
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post #3 of 4 (permalink) Old 02-22-2013, 05:08 AM
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I doubt that any municipal water company would even acknowledge that they are supplying water with high nitrates, because they aren't supposed to do that. I also doubt that they ever deliberately fudge their test results. But, they choose when to do their tests, so I suspect they choose times when they have the best chance of meeting all of the limits. In that roundabout way I'm saying I think there are probably times when the water does contain that much nitrate, but it isn't a continuous thing.

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post #4 of 4 (permalink) Old 02-22-2013, 02:25 PM
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Nitrates

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Originally Posted by jrflanagan View Post
My nitrates out of the tap consistently test between 10-20 ppm with the API drop tests. I realize they are not the most accurate tests out there, but I have tested water from other municipalities and they have tested below 5 ppm.

I have contacted the water department and they said that nitrates always leave the plant less than 5 ppm, and that it was likely an inaccurate test kit or "something in the water matrix interfering with the test method".


Could there be something between the plant and my faucet that raises the nitrates?

Could there be something in the water matrix causing a false positive?
Hello jr...

The EPA allows for 10 ppm of nitrates in public tap water. NO3 occurs naturally from water that moves through the ground. If you have older plumbing, the water moving through the old pipes could add a bit of nitrate to your water. But 20 part per millions is very minimal.

Your fish will adapt to your tap water. Fish have been doing it for decades. Do your large, weekly water changes and you don't need to fret over the water chemistry.

Just a thought.

B

"Fear not my child, just change the tank water."
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