DEFINITION OF ABBREVIATIONS
MCL: Maximum Contaminant Level. The level that cannot be exceeded by
public water systems.
SMCL: Secondary Maximum Contaminant Level. Threshold levels for aesthetic concerns; taste,
odor, and staining.
mg/L: milligrams per liter, which is approximately equal to parts per million (ppm).
pCi/L: picoCuries per liter.
AL: Action Level. 90 percent of samples must fall below this level, pertains mainly to public water supplies.
TOTAL COLIFORM and E. COLI Present is Unacceptable
Total coliform are a group of bacteria with common characteristics
unacceptable water quality. Within the total coliform group, the E.coli bacteria are
specifically used to indicate fecal contamination. High non-coliform counts are usually
from the drilling of the well or an indication of surface water intrusion. When
non-coliform are greater than (>) 200cts/100ml, then can obscure the growth of
coliform and are unacceptable..
If total coliform, especially E.coli and/or high non-coliform counts
are present in a well,
it needs to be checked for construction problems. It is very common for new or
modified wells to have unacceptable bacteria counts, and often it is necessary to
disinfect with bleach or chlorine tablets more than once. If you have a positive total
coliform, E.coli, or high non-coliform count, you should have received an
"Unacceptable Bacteria Notification" which includes disinfection instructions.
pH Recommended 6.5 - 8.5
pH is a measure of the acidity of a sample. The scale is 0 - 14. A
of 0 - 7 is acidic;
7 - 14 is basic (or alkaline), and 7 is neutral. Acidic water along with low hardness (soft water)
tends to be corrosive to your water pipes, potentially dissolving lead and copper . Basic water
itself is not a problem, but may have a bitter taste. Alkalinity, which is a separate measurement,
is your water's buffering capacity against drastic pH changes.
MODERATE 76-150 mg/L
HARD 151-250 mg/L
VERY HARD 250+ mg/L
The contributors to hardness are calcium and magnesium. The
elements in general is not a health hazard, but hardness elements tend to plate out on
water pipes and heating coils in hot water tanks, and reduce the effectiveness of
detergents. Water treatment companies often express hardness in grains per gallon. 1
gpg equals 17.1 mg/L
IRON SMCL = 0.30 mg/L
Over 0.30 mg/L, iron becomes a nuisance element. It will show its
stains on water fixtures and if chlorine bleach is used in the laundry, rust spots will
appear on clothes. If this happens, use a non-chlorine bleach with your clothes.
Common iron removal methods include deionization, oxidation, and filtration.
SMCL = 0.05 mg/L
Over 0.05 mg/L manganese becomes a nuisance element and its presence
detected by purplish black staining of kitchen and bathroom fixtures. The SMCL is the
threshold for small and taste for most humans. Above this level your drinking water
would have an oily vinyl or metallic taste. A "rotten egg" smell due to the presence of
hydrogen sulfide is often associated with a high iron and manganese level, which
tends to disappear when the iron and manganese are removed. Manganese is also an
essential nutrient for humans at approximately 5 mg per day.
SODIUM SMCL = 250 mg/L
Some sodium is found in all natural water supplies, but more so in
seawater and road salt seep into the ground. Sodium has no set hazard level, but
those individuals on a low sodium diet should take into account the amount of sodium
in their water when determining overall sodium intake.
CHLORIDE SMCL = 250 mg/L
Although chloride is not considered a health hazard, the standard
been set because
of the level at which the average person notices a salty taste. Chloride is associated with
infiltration of road salt, fertilizer, backwash from a water softener and even seawater.
NITRATE-NITROGEN MCL = 10 mg/L
NITRITE-NITROGEN MCL = 1 mg/L
The presence of nitrate and nitrite generally indicates
from a pasture, manure pile,
decomposed vegetation or fertilized agricultural land. Nitrates change to
nitrites in the body, which reduces oxygen uptake by the hemoglobin. Boiling the water
will not help, it will only concentrate the nitrates.
FLUORIDE MCL = 4.0 mg/L
Fluoride has been widely used to prevent tooth decay, but in excess
it can cause spotted or
even pitted teeth, called fluorosis. Recommended adult intake of fluoride is 1.0 - 2.5 mg per day.
Children are often given a supplement if their home drinking water is not sufficient.
COPPER AL = 1.3 mg/L SMCL = 1.0 mg/L
The high copper concentrations in New Hampshire are almost always a
result of corrosive
water picking up copper from plumbing lines. The acceptable limit was set because
above 1.0 mg/L the water may have an unpleasant taste and cause blue or green staining on water use fixtures.
LEAD AL = 0.015 mg/L
Chronic ingestion of lead has been associated with a large number of
harmful health effects,
and therefore water with excessive lead levels should not be consumed. Most
of the high levels are attributed to old lead piping and even lead solder used on copper
piping. In most cases lead in your drinking water can be reduced by running the water
before filling a glass to drink. Water neutralization will reduce corrosion damage.
ARSENIC MCL = 0.050 mg/L 12/06 is 0.010mg/L
The U.S. EPA has set the health standard at 0.050 mg/L, which is
significantly lowered over the next few years. Some of these health effects are bladder
cancer, skin irritation, skin cancer, liver and central nervous system damage. Its
origins in New Hampshire drinking waters has not been defined, yet natural bedrock
sources and manmade arsenic compounds are primary suspects.
GROSS ALPHA RADIONUCLIDES MCL = 15 pCi/L
There are several elements which are radioactive and may occur in
New Hampshire. They emit alpha particles, (ionized radiation), and are believed to be
carcinogenic. The Gross alpha test is a "total" measurement of alpha emitting
particles including Radium and Uranium.
There is a unique protocol for interpreting the above MCL of the gross alpha test. One
must subtract the Uranium alpha particle result from the Gross alpha test to see if the
MCL has been met. Therefore if the Gross alpha exceeds 15 pCi/L further analysis is
Because there is also a seperate MCL for the element Radium,
your Gross alpha
result exceeds 5 pCi/L, further analysis should be done to identify the presence of Radium.
URANIUM MCL = 30 ug/L
A naturally occurring radioactive contaminant that occurs in both
water and surface
water. It has been found to cause bone cancer in humans at high exposure levels, and is
believed to be toxic to kidneys.
RADIUM 226 MCL = 5pCi/L
A naturally occurring radioactive contaminant that occurs primarily
in ground water. It has
been found to cause bone cancer in humans at high exposure levels, and possibly other cancers as well.
RADON No MCL yet was 300pCi/L (maybe 80 or 4000)
A naturally occurring radioactive contaminant that is a decay
of Radium. It is a
gas that is released into the air during water use. Radon has been found to cause lung
cancer in humans at high exposure levels. A radon concentration of 10,000 pCi/L
potentially could add 1 pCi/L of radon to one's home air level. EPA's recommended
airborne action level is 4 pCi/L.
VOLATILE ORGANIC COMPOUNDS
No volatile organic compounds (VOCs) are normally detected in a
of VOCs may be indicative of a well contaminated by petroleum products, industrial
solvents or by-products from the process of disinfecting a well. The presence of any of
these compounds is potentially a health risk.