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In order to ensure that tap water is safe to drink, EPA prescribes regulations which limit the amount of contaminants in water provided by public water systems. The table below lists all of the drinking water contaminants that we detected during the calendar year of this report. Although many more contaminants were tested, only those substances listed below were found in your water. All sources of drinking water contain some naturally occurring contaminants. At low levels, these substances are generally not harmful in our drinking water. Removing all contaminants would be extremely expensive, and in most cases, would not provide increased protection of public health. A few naturally occurring minerals may actually improve the taste of drinking water and have nutritional value at low levels. Unless otherwise noted, the data presented in this table is from testing done in the calendar year of the report. The EPA or the State requires us to monitor for certain contaminants less than once per year because the concentrations of these contaminants do not vary significantly from year to year, or the system is not considered vulnerable to this type of contamination. As such, some of our data, though representative, may be more than one year old. In this table you will find terms and abbreviations that might not be familiar to you. To help you better understand these terms, we have provided the definitions below the table.
Contaminants |
MCLG |
MCL, |
Your |
Range |
Sample |
Violation |
Typical
Source |
|
Low |
High |
|||||||
Microbiological Contaminants |
||||||||
Total Coliform (positive samples/month) |
0 |
1 |
0 |
NA |
2015 |
No |
Naturally present in the environment |
|
Radioactive Contaminants |
||||||||
Radium (combined 226/228) (pCi/L) |
0 |
5 |
3.7 |
2.7 |
6.1 |
2015 |
No |
Erosion of natural deposits |
The following contaminants were monitored for, but not detected, in your water.
Contaminants |
MCLG |
MCL, |
Your |
Violation |
Typical
Source |
16-a-hydroxyestradiol (estriol)
(ppb) |
2 |
ND |
No |
||
17-a-ethynylestradiol (ethinyl
estradiol) (ppb) |
2 |
ND |
No |
||
17-ß-estradiol (ppb) |
2 |
ND |
No |
||
4-androstene-3,17-dione (ppb) |
2 |
ND |
No |
||
Haloacetic Acids
(HAA5) (ppb) |
NA |
60 |
ND |
No |
By-product of drinking water chlorination |
Nitrate [measured as Nitrogen] (ppm) |
10 |
10 |
ND |
No |
Runoff from fertilizer use; Leaching from septic tanks,
sewage; Erosion of natural deposits |
TTHMs [Total Trihalomethanes]
(ppb) |
NA |
80 |
ND |
No |
By-product of drinking water disinfection |
equilin (ppb) |
2 |
ND |
No |
||
estrone (ppb) |
2 |
ND |
No |
||
testosterone (ppb) |
2 |
ND |
No |
As part of an on-going evaluation program the EPA has required us to monitor some additional contaminants/chemicals. Information collected through the monitoring of these contaminants/chemicals will help to ensure that future decisions on drinking water standards are based on sound science.
Name |
Reported
Level |
Range |
|
Low |
High |
||
16-a-hydroxyestradiol (estriol)
(ppb) |
|||
17-a-ethynylestradiol (ethinyl
estradiol) (ppb) |
|||
17-ß-estradiol (ppb) |
|||
4-androstene-3,17-dione (ppb) |
|||
equilin (ppb) |
|||
estrone (ppb) |
|||
testosterone (ppb) |
Unit Descriptions |
|
Term |
Definition |
ppm |
ppm: parts
per million, or milligrams per liter (mg/L) |
ppb |
ppb: parts
per billion, or micrograms per liter (µg/L) |
pCi/L |
pCi/L:
picocuries per liter (a measure of radioactivity) |
positive
samples/month |
positive samples/month:
Number of samples taken monthly that were found to be positive |
NA |
NA: not
applicable |
ND |
ND: Not
detected |
NR |
NR:
Monitoring not required, but recommended. |
Important Drinking Water Definitions |
|
Term |
Definition |
MCLG |
MCLG: Maximum Contaminant Level Goal: The level of a
contaminant in drinking water below which there is no known or expected risk
to health. MCLGs allow for a margin of safety. |
MCL |
MCL: Maximum Contaminant Level: The highest level of a contaminant
that is allowed in drinking water. MCLs are set as close to the MCLGs as
feasible using the best available treatment technology. |
TT |
TT: Treatment Technique: A required process intended to
reduce the level of a contaminant in drinking water. |
AL |
AL: Action Level: The concentration of a contaminant
which, if exceeded, triggers treatment or other requirements which a water
system must follow. |
Variances
and Exemptions |
Variances and Exemptions: State or EPA permission not to meet
an MCL or a treatment technique under certain conditions. |
MRDLG |
MRDLG: Maximum residual disinfection level goal. The level
of a drinking water disinfectant below which there is no known or expected
risk to health. MRDLGs do not reflect the benefits of the use of
disinfectants to control microbial contaminants. |
MRDL |
MRDL: Maximum residual disinfectant level. The highest
level of a disinfectant allowed in drinking water. There is convincing
evidence that addition of a disinfectant is necessary for control of
microbial contaminants. |
MNR |
MNR: Monitored Not Regulated |
MPL |
MPL: State Assigned Maximum Permissible Level |
For more information please contact: |
Contact Name: Dana Waite
Address: PO Box 455
St. Johns, Az 85936
Phone: 928.337.4517