Drinking Water Compliance Monitoring
Tier 1 Public Notice - Required Within 24 Hours
- Fecal coliform maximum contaminant level (MCL) violation or failure to test for fecal contamination after total coliform test is positive
- Nitrate/nitrite/combined nitrate and nitrite MCL violation or failure to take confirmation sample
- Chlorine dioxide maximum residual distribution level (MRDL) violation in distribution system or failure to take repeat samples in distribution system
- Exceedance of maximum allowable turbidity level resulting in an MCL or treatment technique (TT) violation, when the State or EPA determines a Tier 1 notice is warranted
- Special public notice for non-community water systems with nitrate exceedances between 10 mg/l and 20 mg/l, when allowed to exceed MCL (10 mg/l) by the State
- Waterborne disease outbreak or other waterborne emergency
- Other situations as determined by the primacy agency
Tier 2 Public Notice - Required Within 30 Days
- All other MCL, MRDL, and TT violations not identified as a Tier 1 notice
- Monitoring and testing procedure violations, when the primacy agency requires a Tier 2 (rather than Tier 3) notice
- Failure to comply with variance and exemption (V&E) conditions
Tier 3 Public Notice - Required Within 1 Year
- All other monitoring or testing procedure violations not already requiring a Tier 1 or Tier 2 notice
- Operation under a V & E
- Special public notices (i.e., exceedance of the fluoride secondary maximum contaminant level (SMCL); announcing the availability of unregulated contaminant monitoring results)
Bureau of Water . Phone: (803) 898-4300 . Fax: (803) 898-3795 . Contact Us