Total Trihalomethanes (TTHMs) are regulated by the Safe Drinking Water Act through the Stage 2 Disinfectant Byproduct Rule. The City of Bloomington Utilities collects monthly samples at 8 testing locations throughout the distribution system and follows a quarterly compliance schedule. Compliance is calculated on a Locational Running Annual Average (LRAA). The Maximum Contaminant Level for TTHMs is 80 µg/l. Micrograms per liter (µg/l) is equal to parts per billion (ppb). One part per billion is roughly equal to a teaspoon of water in an Olympic-size swimming pool.
This dataset has the following 12 columns:
| Column Name | API Column Name | Data Type | Description | Sample Values |
|---|---|---|---|---|
| Date | date | calendar_date | Date of sample collection | 2022-06-21T00:00:00.000 2023-05-16T00:00:00.000 2022-01-18T00:00:00.000 2018-10-18T00:00:00.000 2020-08-20T00:00:00.000 view top 100 |
| Marlin | marlin | number | Sample collected at a dedicated sampling station outside Marlin Elementary School, 1655 E. Bethel Ln. | 43.0 48.63 52.28 44.08 42.8 view top 100 |
| Service Center | service_center | number | Sample collected at the City of Bloomington Utilities Service Center, 600 E. Miller Dr. | 41.7 41.8 43.03 42.29 43.34 view top 100 |
| College Mall | college_mall | number | Sample collected at a dedicated sampling station near College Mall, 2894 E. 3rd St. | 40.0 43.81 42.08 39.80 40.1 view top 100 |
| Hospital | hospital | number | Former sample collection site was located at IU Health Bloomington Hospital, 601 W. 2nd St. | 52.80 42.98 43.94 40.35 44.21 view top 100 |
| Blucher Poole | blucher_poole | number | Sample collected at the Blucher Poole Wastewater Treatment Plant, 5555 N. Bottom Rd. | 45.00 50.30 44.3 47.0 44.2 view top 100 |
| Profile | profile | number | Sample collected at a dedicated sampling station at 601 N. Profile Parkway | 40.9 51.6 40.6 47.30 43.30 view top 100 |
| Gentry | gentry | number | Sample collected at a dedicated sampling station in the Gentry East neighborhood at 4614 E. Donnington Dr. | 42.0 49.23 42.2 48.3 53.02 view top 100 |
| Miller Showers | miller_showers | number | Sample collected at a dedicated sampling station near Miller Showers Park, at 1919 N. College Ave. | 42.3 41.7 49.60 42.46 43.06 view top 100 |
| Showers Bldg | showers_bldg | number | Sample collected at Showers Building City Hall, 401 N. Morton St. | 42.4 41.7 51.68 44.9 42.0 view top 100 |
| 12-Month Average Limit | _12_month_average_limit | number | DBP regulatory limit established by the Environmental Protection Agency and enforced by the Indiana Department of Environmental Management, as a 12 month average. | 80 view top 100 |
| 12-Month Average Goal | _12_month_average_goal | number | City of Bloomington Utilities DBP goal to stay well below the EPA and IDEM regulatory limits, as a 12 month average. | 50 view top 100 |