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Number of adjusted community water systems using selected state-established control ranges during 2006–2010
| Control Range | Number of Adjusted Systems using Control Range |
Number of States in which these Adjusted Systems are Located |
|---|---|---|
| –0.1/+0.5 mg/L | 893 | 18 |
| ±0.3 mg/L | 160 | 6 |
| ±0.2 mg/L | 202 | 10 |
