US Water Score: A
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
1.0
|
15 ppb | 1 ppb | Passed |
UCMR5 occurrence results are screening information, not a finding of regulatory compliance or noncompliance. PFAS rules and compliance dates are evolving.
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFBA | 22.0 ppt | No standard | 500 ppt | No federal MCL shown |
Water Quality Summary
Tap water quality in Cosby, Tennessee (37722) receives an overall grade of A (Lower record-based concern) with a score of 98 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 8 points above the Tennessee state average of 90. Compared to the national average (75), this area performs significantly better. The area is served by 3 water systems providing water to approximately 34,925 people, using surface water and groundwater sources. PFAS testing detected 1 compound, all below the EPA final MCL values used for comparison.
A score of 98/100 means public water-system records for Cosby, TN show relatively few concerns in the US Water Score model. This is an internal score, not an EPA safety rating, and it does not guarantee conditions at any specific tap.
Health Information
Lead is a toxic metal that can leach from aging pipes and plumbing fixtures.
Even low levels of lead exposure can cause developmental delays in children, kidney damage, and cardiovascular effects in adults. The EPA action level is 15 ppb, but health experts recommend no safe level of lead in drinking water.
Lead enters water primarily through corrosion of lead service lines, lead solder, and brass fixtures — especially in homes built before 1986.
If lead is detected above 1 ppb, consider using a certified lead-removal filter (NSF/ANSI 53) for drinking and cooking water. Run cold water for 30 seconds before use if water has been sitting in pipes.
Common Questions
Based on public water-system records, Cosby, Tennessee receives an internal US Water Score grade of A (Lower record-based concern) with a score of 98/100. This indicates relatively few system-level concerns in our model, but it is not an EPA safety rating and does not guarantee tap conditions inside individual homes.
ZIP code 37722 is served by 3 water systems using surface water, groundwater sources, providing water to approximately 34,925 people. Multiple source types mean your water may come from a blend of surface and underground sources.
Lead levels in Cosby, Tennessee are 1.0 ppb, which is at or below the health guideline of 1 ppb. This is a positive result, though periodic testing is still recommended.
1 PFAS compound were detected in water serving Cosby, Tennessee, with reported values below the EPA final MCL values used by this site. This comparison is informational: federal compliance timelines and the status of some PFAS standards are still evolving. Activated carbon or reverse osmosis filters can reduce some PFAS when appropriately certified and maintained.
Water systems serving Cosby, Tennessee have received 4 violations in the last 5 years. Violations can range from paperwork issues (monitoring & reporting) to serious health-based violations where contaminant levels exceeded safe limits. Review the violation details above for specifics.
Based on detected contaminants (PFAS), residents in Cosby, Tennessee should consider: Reverse osmosis (RO) system — most effective for PFAS, lead, and other contaminants. Always look for filters with NSF/ANSI certification for the specific contaminants you want to remove.