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Number of states applying various beach monitoring techniques [14].
| Regulatory practice | Number of states |
|---|---|
| Sampling location | |
| Ankle | 2 |
| Knee | 15 |
| Waist | 13 |
| Frequency of sampling based on | |
| Usage | 22 |
| Season | 28 |
| Location of sampling based on Usage or point source | 25 |
| States allowed to issue advisories | 30 |
| States allowed to issue closures | 17 |
| Presumptive rainfall standards | 17 |
| Predictive models used | 5 |
| Unique microbial indicators used | 2 |
| Chemical indicators used | 2 |
