- Home
- Departments
- Health Department
- Environment Health
- Public Water Supply
- Monitoring Results From Public Supply Wells
Eight of the 66 public supply wells tested (12%) exhibited pesticide detections in 2001 and 6 different pesticides were detected in Nassau County public supply wells. TCPA (tetrachloroterephthalic acid), a dacthal metabolite, was the most frequently detected pesticide compound in Nassau County public supply wells, being detected in six of the 66 (9%) public supply wells tested in Nassau County. The detections ranged from 7 ug/L to 17 ug/L. The Maximum Contaminant Level (MCL) for this compound is the generic Unspecified Organic Contaminant (UOC) standard of 50 ug/L.
The 5 other pesticides that were detected in Nassau County public supply wells were: Atrazine, Dibromochloropropane (DBCP), Desethylatrazine, Ethylene dibromide (EDB) and Prometon. Table 1 lists the public supply well, water system and level detected for each detected pesticide in Nassau County.
PESTICIDE | WELLS(S) DETECTED | LOCATION | LEVEL (ug/L) | MCL (UG/L) |
---|---|---|---|---|
Atrazine | N-3704 | WestHempstead W.D. | 0.19 | 3.0 |
Desethyhtrazine | N-9211 | City of Glen Cove | 0.05 | 50.0 |
DBCP (Dibromachbropropane) | N-9211 | City of Glen Cove | 0,11 | 0.12 |
EDB (Ethylenedibromide) | N-8010 | Roslyn Water District | 0.07* | 0.05 |
Prometon | N-4077 | W.A. of Western Nassau | 0.12 | 50.0 |
TCPA | N-10612 N-9211 N-37 N-12639 N-3704 N-10401 | Garden City Park W.D. City of Glen Cove Sands Point Village Sands Point Village West Hempstead W.D. West Hempstead W.D. | 7 17 7 10 6 7 | 50.0 |
* Exceeds MCL of 0.05 ug/L established for this compound |
Only one of the pesticides detected, Ethylene dibromide (EDB), exceeded the Maximum Contaminant Level (MCL) established for the compound. EDB was detected at a level of 0.07 ug/L in Roslyn Water District's Well # 8 (N-8010), exceeding the 0.05 ug/L MCL established for this compound. This well has a history of EDB detections from water system and NCDH routine monitoring and, since 1998, utilizes granular activated carbon (GAC) filtration.