Good Water Quality
| Contaminant | Detected Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| Lead |
3.0
|
15 ppb | 1 ppb | Warning |
| Compound | Level | EPA MCL | Health Guideline | Status |
|---|---|---|---|---|
| PFHxA | 3.0 ppt | No standard | 400 ppt | Unregulated |
Water Quality Summary
Tap water quality in Markham, Illinois (60428) receives an overall grade of B (Good) with a score of 71 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is roughly in line with the Illinois state average of 74. The area is served by 2 water systems providing water to approximately 12,525 people, using surface water sources. Testing has found elevated levels of Lead that warrant attention. PFAS testing detected 1 compound, all currently below EPA limits. The area has 16 violations over the past 5 years, though none were classified as health-based.
A score of 71/100 means the water in Markham, IL is generally good and meets EPA standards, with only minor areas of concern. There may be low levels of detectable contaminants or a small number of non-critical violations. Most residents can feel comfortable with their tap water quality, though basic filtration can provide an extra layer of protection.
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 EPA data, tap water in Markham, Illinois receives a grade of B (Good) with a score of 71/100. This indicates the water meets federal standards and has relatively few concerns. However, individual homes may still have localized issues such as lead from old plumbing.
ZIP code 60428 is served by 2 water systems using surface water sources, providing water to approximately 12,525 people. Surface water systems are more susceptible to contamination from agricultural runoff, industrial discharge, and weather events, but typically undergo more extensive treatment including filtration and disinfection.
Lead was detected at 3.0 ppb in Markham, Illinois. While this is below the EPA action level of 15 ppb, it exceeds the health guideline of 1 ppb recommended by health organizations. Consider a certified lead filter, especially if you have young children.
1 PFAS compound were detected in water serving Markham, Illinois, but all are currently below EPA limits. While levels are within regulatory standards, some health organizations recommend minimizing any PFAS exposure. Activated carbon or reverse osmosis filters can reduce PFAS levels.
Water systems serving Markham, Illinois have received 16 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 (lead, PFAS), residents in Markham, Illinois 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.