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Region
- PennsylvaniaChester County4
- Floridan Aquifer3
- Minnesota3
- Southern States3
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- Connecticut2
- ConnecticutColchester2
- ConnecticutEast Hampton2
- ConnecticutWoodstock2
- DelawareDover Air Force Base2
- Illinois2
- Louisiana2
- Memphis Aquifer2
- New JerseyMorris County2
- Puerto Rico2
- Tennessee, West2
- Wyoming2
- California1
- CaliforniaBunker Hill Basin1
- CaliforniaMonterey County1