Record-only indicator: A
Not a safety rating. Missing or old measurements can produce a high score.
Coverage: 1/1 mapped systems have a dated lead result; 0/1 have copper results; 0/1 have UCMR monitoring.
| Contaminant | Reported value or bound | Historical comparison value | Interpretation | Status |
|---|---|---|---|---|
| Lead |
4.0 ppbPeriod end: 12/31/2024
|
15 ppb | Largest reported value or bound among mapped systems; not necessarily the largest actual concentration. | At/below comparison value |
Public-record summary
Record-only indicator — incomplete or old records can produce a high score. A score of 100 is not a safety finding. Coverage: 1/1 mapped systems have a dated lead result; 0/1 have copper results; 0/1 have UCMR monitoring. Tap water quality in Union Bridge, Maryland (21791) receives an record-only indicator of A (Lower record-based concern) with a score of 95 out of 100, based on analysis of EPA compliance data, contaminant testing, and violation history. This is 15 points above the Maryland state average of 80. The area is served by Town Of Union Bridge, a surface water system providing water to approximately 997 people. The area has a clean violation record over the past 5 years — a positive indicator of consistent water quality management.
Grade A summarizes the records available to this model, not household safety. Missing, bounded or old measurements can produce a high score, including 100. Review coverage, dates and the current utility report before interpreting this indicator.
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
The record-only indicator is A (95/100). It cannot determine whether your tap water is safe. Missing, bounded or old measurements can produce a high score. Check the coverage and sampling dates below and your utility's current notices.
ZIP code 21791 is served by 1 water system using surface water sources, providing water to approximately 997 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.
The largest reported lead value or bound is 4.0 ppb, for the sampling period ending 12/31/2024. This is a system-level 90th-percentile record, not a measurement at your tap. Compare the sampling date and original utility report before interpreting it.
Water systems serving Union Bridge, Maryland have no matching PFAS monitoring result in this published dataset. This does not mean PFAS are absent — it means no data is currently available. Coverage varies by system and sampling period. You can request PFAS testing from your water utility or use a certified home test kit.
Water systems serving Union Bridge, Maryland have zero violations in the last 5 years. No recorded violation does not establish compliance or tap-water safety; records may be delayed or incomplete.
This public-record indicator cannot select household treatment. Confirm your supplier, current utility report and tap-testing results first; match any treatment to a certified contaminant-reduction claim and follow its maintenance instructions.
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