chlorodifluoromethane (HCFC-22) is a chemical contaminant that is a potential threat to human health.
| CA Water Service - Los Altos Suburban | 250 µg/L (on 12/17/2013) | CA |
|---|---|---|
| Sacramento Suburban Water District | 15 µg/L (on 8/11/2014) | CA |
| City of Fresno | 14 µg/L (on 4/2/2015) | CA |
| City of Porterville | 8.20 µg/L (on 9/26/2013) | CA |
| City of Newman Water Department | 8 µg/L (on 11/25/2013) | CA |
| City of Arlington | 7.95 µg/L (on 11/19/2013) | TX |
| City of Modesto | 7.20 µg/L (on 5/13/2013) | CA |
| SCI Graterford | 7.1 µg/L (on 7/22/2013) | PA |
| CA Water Service - Visalia | 6.90 µg/L (on 7/6/2015) | CA |
| Scotts Valley Water District | 6.60 µg/L (on 5/8/2013) | CA |
| Fridley | 5.80 µg/L (on 4/16/2014) | MN |
| Aqua PA - Hatboro | 5.7710 µg/L (on 6/25/2014) | PA |
| CA American Water Co. - Lincoln Oaks | 5.49 µg/L (on 5/27/2015) | CA |
| Southeast Morris County MUA | 5.30 µg/L (on 3/25/2015) | NJ |
| City of Zephyrhills | 5 µg/L (on 4/4/2014) | FL |
| Franklin Square Water District | 5 µg/L (on 11/26/2013) | NY |
| Ponce Urbano | 4.92 µg/L (on 11/18/2016) | PR |
| Kent County Water Authority | 4.60 µg/L (on 11/19/2014) | RI |
| City of Brentwood | 4.30 µg/L (on 8/25/2014) | CA |
| Waipahu-Ewa-Waianae | 3.60 µg/L (on 7/1/2013) | HI |
| City of Hastings | 2.98 µg/L (on 11/19/2013) | NE |
| Murray City Water System | 2.9710 µg/L (on 9/19/2014) | UT |
| City of Sunnyvale | 2.50 µg/L (on 4/15/2015) | CA |
| Rowley Water Department | 2.495 µg/L (on 2/4/2013) | MA |
| Perkasie Borough Authority | 2.30 µg/L (on 3/26/2013) | PA |
| Northampton Bucks County Municipal Authority | 2.30 µg/L (on 2/12/2015) | PA |
| Metropolitan DWID | 2.20 µg/L (on 2/19/2015) | AZ |
| City of North Platte | 2.20 µg/L (on 4/15/2014) | NE |
| Bayleaf Master | 1.80 µg/L (on 3/5/2015) | NC |
| City of Tempe | 1.70 µg/L (on 1/15/2014) | AZ |
| IL American Water Co. - Peoria | 1.69 µg/L (on 4/8/2013) | IL |
| Granger-Hunter Improvement District | 1.60 µg/L (on 8/12/2014) | UT |
| San Jose Water Company | 1.50 µg/L (on 2/10/2014) | CA |
| Jericho Water District | 1.40 µg/L (on 9/22/2015) | NY |
| CA Water Service - Chico | 1.30 µg/L (on 1/8/2014) | CA |
| MDWASA - Rex Utilities | 1.30 µg/L (on 6/9/2015) | FL |
| First Utility District of Hawkins County #1 | 1.30 µg/L (on 8/19/2013) | TN |
| City of Los Banos | 1.20 µg/L (on 9/9/2015) | CA |
| Great Oaks Water Company, Inc. | 1.20 µg/L (on 6/24/2015) | CA |
| City of Woodland | 1.20 µg/L (on 4/1/2014) | CA |
| City of Vacaville | 1.10 µg/L (on 3/12/2014) | CA |
| Moore County Public Utilities - Pinehurst | 1.10 µg/L (on 8/27/2013) | NC |
| Manati East | 1.03 µg/L (on 3/24/2015) | PR |
| Town of Hempstead Water District | 1 µg/L (on 12/10/2014) | NY |
| Roslyn Water District | 1 µg/L (on 2/10/2015) | NY |
| Town of Payson | 0.97 µg/L (on 6/18/2014) | AZ |
| City of Hallandale Beach | 0.93 µg/L (on 8/20/2013) | FL |
| Emerald Coast Utilities Authority | 0.92 µg/L (on 11/5/2014) | FL |
| Bourne Water District | 0.89 µg/L (on 11/24/2014) | MA |
| Village of Hempstead | 0.89 µg/L (on 6/18/2013) | NY |