Naphthalene
Helena Water Sewer
Naphthalene is a polycyclic aromatic hydrocarbon, or PAH, released from combustion of fossil fuels and waste incinerators, and also used as a moth repellent. PAHs increase the risk of cancer; damage the immune, nervous and reproductive systems; and can harm developing fetuses.
10
Samples
0
Samples exceeding legal limit (MCL)
0
Samples exceeding
health guidelines
Testing results - average by year
| Year | Average result | Samples taken | Detections | Range of results |
|---|---|---|---|---|
| 2014 | ND | 2 | 0 | ND |
| 2015 | ND | 1 | 0 | ND |
| 2016 | ND | 2 | 0 | ND |
| 2017 | ND | 2 | 0 | ND |
| 2018 | ND | 2 | 0 | ND |
| 2019 | ND | 1 | 0 | ND |
ppb = parts per billion
All test results
| Date | Lab ID | Result |
|---|---|---|
| 2014-04-22 | 14114014201 | ND |
| 2014-08-19 | 14233000301 | ND |
| 2015-08-06 | 15219000507 | ND |
| 2016-03-07 | 16070002601 | ND |
| 2016-06-13 | 16168007501 | ND |
| 2017-05-31 | 17152005001 | ND |
| 2017-08-29 | 17242001601 | ND |
| 2018-07-17 | 18200000307 | ND |
| 2018-10-22 | 18298004207 | ND |
| 2019-07-23 | 19206006601 | ND |