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Old 09-26-2009, 02:54 PM   #1
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How bad is my tap water?

Here is a report from 2008 in my city

City of Davenport 2008 Contaminant Data Table Florida Water System # 6530431


** Results in the Level Detected column for radiological and inorganic contaminants are from the highest detected level at any sampling point.


Contaminant and
Unit of Measurement
Dates of sampling (mo./yr.)
MCL Violation Yes/No
Level Detected **
MCLG
MCL
Likely Source of Contamination


Radiological Contaminants


Alpha (pCi/l)
1/08 - 12/08
N
1.7
0
5
Erosion of natural deposits


Radium 226 + 228 or
combined Radium (pCi/l) (pCi/L)

1/08 - 12/08
N
1.5
0
5
Erosion of natural deposits


Uranium (μg/L)
1/08 - 12/08
N
2.3
0
30
Erosion of natural deposits


Inorganic Contaminants


Barium (ppm)
1/08 - 12/08
N
0.015
2
2
Discharge of drilling wastes; discharge from metal refineries; erosion of natural deposits


Chromium (ppb)
1/08 - 12/08
N
4.77
100
100
Discharge from steel and pulp mills; erosion of natural deposits


Nickel (ppb)
1/08 - 12/08
N
1.04
N/A
100
Pollution from mining and refining operations. Natural occurrence in soil.


Nitrate (as Nitrogen) (ppm)
1/08 - 12/08
N
0.763
10
10
Runoff from fertilizer use; leaching from septic tanks, sewage; erosion of natural deposits


Selenium (ppb)
1/08 - 12/08
N
2.226
50
50
Discharge from petroleum and metal refineries; erosion of natural deposits; discharge from mines


Sodium (ppm)
1/08 - 12/08
N
4.93
n/a
150
Salt water intrusion, leaching from soil


TTHMs and Stage 1 Disinfectant/Disinfection By-Product (D/DBP) Contaminants


Chlorine: Level Detected is the 2007 monthly average for residual Chlorine; Range of Results is the range of 2007 monthly Chlorine residual level results (lowest to highest) at the individual sampling sites. HAA5s and TTHMs: Level Detected is from a single sample.


Contaminant and Unit of Measurement
Dates of Sampling (mo./yr.)
MCL Violation Yes/No
Level Detected
Range of Results
MCLG or MRDLG
MCL or MRDL
Likely Source of Contamination

Chlorine (ppm)
1/08 - 12/08
N
0.7
0.5 1.1
MRDLG: 4
MRDL: 4.0
Water additive used to control microbes

Haloacetic Acids (five) (HAA5) (ppb)
7/08
N
8.05
n/a
n/a
MCL = 60
By-product of drinking water disinfection

TTHM [Total trihalomethanes] (ppb)
7/08
N
18.8
n/a
n/a
MCL = 80
By-product of drinking water disinfection
Lead and Copper (Tap Water)

Contaminant and
Unit of Measurement
Action Level
Violation

Yes / No
90th Percentile

Result

Number of Sampling Sites Exceeding the Action Level
MCLG
Action Level
Monitoring Period
Month / Year

Likely Source of Contamination

Copper (tap water) ppm)
No
0.817
0
1.3
AL=1.3
6/08 9/08
Corrosion of household plumbing systems; erosion of natural deposits; leaching from wood preservatives

Lead (tap water) (ppb)
No
2.47
1
0
AL=15
6/08 9/08
Corrosion of household plumbing systems, erosion of natural deposits
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Old 09-26-2009, 03:09 PM   #2
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These reports are nice, but useless when it comes to figuring out what is really in your water, at your tap. What may be there one week may be gone the next. The reports are just a snapshot in time... and always are the snapshot that comply with Federal regulations!

For example, my water is normally 80-90 ppm TDS out of the tap. For about a 3 week stretch this summer, it went down to 20-30ppm, then went back to 80-90. I've also had nitrates come and go. Water quality will also depend on the pipes in your house.

In the end, if you want consistent water parameters, an RO/DI filter is the only way to guarantee your water is good. Many people use tap water (treated with a dechlorinator) with no issues, but I wouldn't really let the water quality make the decision for you.
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Old 09-26-2009, 06:05 PM   #3
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Working for a water municipality I would say no tap water for a reef tank. FW and FOWLR SW tanks you would be OK but still better if you dont use tap IMO. They dont show everything in those Quality reports. What kind of tank is this water for?
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Old 09-26-2009, 06:08 PM   #4
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That's interesting because I just checked my TDS this morning out of my basin that I hook my RO/DI to...I got a reading of 69 out of the pipe and 0 out of my unit. It's hard to believe tht the EPA allows a max. of 500 TDS out of your faucet.
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