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Rockville, MD Tap Water Quality 2026

Water quality report for Rockville, MD — PFAS, lead and copper results, violation history and state inspection findings from EPA SDWIS.

A look at Rockville's drinking water using EPA enforcement records: violations, lead and copper results, PFAS sampling and state inspection findings.

Main Utility: City Of Rockville PWSID: MD0150003 Updated: 2026 Q2
✅

No federal limits exceeded on record

Lead was not detected and no violations are open. No PFAS was detected.

A

Rockville earns an A for water quality

Graded on violations, lead, and PFAS, with state inspection findings.

Lead: not detected
PFAS tested, none detected
16 violations since 2015, 0 health-based
No violations currently open
Rockville's lead level vs. all Maryland community water systems
0 ppb5 ppb10 ppb15 ppb
Lead level: Not detected — 0% of the federal action level
✓ Lower lead than % of Maryland utilities
Population Served
45569
~17500 connections
Water Source
Surface water
Drawn from surface water — SDWIS source code SW
Active Violations
0
16 since 2015, all resolved

Lead & Copper Testing

Lead (Pb)
90th percentile of tap samples collected across the distribution system
0% of EPA action level
Not detected
Action level: 15 ppb
Lead was not detected at the 90th percentile — the result fell below the laboratory detection limit. That is not the same as an absence of lead in every tap, and older homes with lead service lines can still show higher readings.

Contaminant Violations (2015–Present)

ContaminantTypeMeasuredLimitPeriodStatus
LEAD AND COPPER RULE REVISIONS REPORTING FAILURE — — 2025 Resolved
Endrin MONITORING AND REPORTING — 0.002 mg/L 2023 Resolved
BHC-GAMMA MONITORING AND REPORTING — 0.0002 mg/L 2023 Resolved
Methoxychlor MONITORING AND REPORTING — 0.04 mg/L 2023 Resolved
Toxaphene MONITORING AND REPORTING — 0.003 mg/L 2023 Resolved
Di(2-ethylhexyl) adipate MONITORING AND REPORTING — 0.4 mg/L 2023 Resolved
Simazine MONITORING AND REPORTING — 0.004 mg/L 2023 Resolved
Di(2-ethylhexyl) phthalate MONITORING AND REPORTING — 0.006 mg/L 2023 Resolved
Hexachlorocyclopentadiene MONITORING AND REPORTING — 0.05 mg/L 2023 Resolved
Atrazine MONITORING AND REPORTING — 0.003 mg/L 2023 Resolved
LASSO MONITORING AND REPORTING — — 2023 Resolved
Heptachlor MONITORING AND REPORTING — 0.0004 mg/L 2023 Resolved
Heptachlor epoxide MONITORING AND REPORTING — 0.0002 mg/L 2023 Resolved
HEXACHLOROBENZENE MONITORING AND REPORTING — 0.001 mg/L 2023 Resolved
Benzo(a)pyrene MONITORING AND REPORTING — 0.0002 mg/L 2023 Resolved
Chlordane MONITORING AND REPORTING — 0.002 mg/L 2023 Resolved
Understanding violation types MCL violations mean a contaminant exceeded the federal maximum limit — the most serious type.
TT (Treatment Technique) violations mean required treatment procedures weren't followed, but don't necessarily mean contamination occurred.

Violation History

16 violations are on record since 2015, of which 0 were health-based. All have been resolved and none remain open.

About the Main Water System

Utility City Of Rockville
PWSID MD0150003
Water source Surface water — Drawn from surface water — SDWIS source code SW
Population served 45,569
Service connections 17,500
Systems serving this area 2
Regulator State primacy agency
Data through 2026 Q2 — EPA SDWIS

Frequently Asked Questions

Is Rockville tap water safe to drink? ▼
No federal limit is exceeded on record. No violations are currently open.
Does Rockville water have PFAS? ▼
It was tested for the six regulated PFAS compounds and none were detected.
Who supplies water to Rockville? ▼
City Of Rockville (PWSID MD0150003), one of 2 systems serving this area. Surface water. Drawn from surface water — SDWIS source code SW
When was this system last inspected? ▼
It was last inspected on 2025-06-09. No significant deficiencies were recorded.

What Should Rockville Residents Do?

1
Read your annual water report
Your supplier publishes a Consumer Confidence Report each July covering the prior year.
2
Check for a lead service line
Lead reaches tap water mainly through service lines and household plumbing. Suppliers now publish an inventory identifying lead lines.
3
Flush before drinking
If water has sat in pipes more than six hours, run the cold tap for two minutes before drinking or cooking.

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