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CITY OF ROCKVILLElikely match
City water report · 2026

Is Rockville Tap Water Safe? 2026 Water Quality Report

Short answer: No measured result is above a legal limit. City of Rockville serves 52,000 residents.

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Likely match, check your bill

CITY OF ROCKVILLE serves Rockville

Your water bill or annual water quality report names your actual supplier.

Source
Surface water
Lead service lines
0 lead, 8,298 unknown
  • CITY OF ROCKVILLEThis report
    MD0150003 · 52,000 served
Every detected result

4 detected results, by distance from their limit

CITY OF ROCKVILLE (EPA PWSID MD0150003) delivers surface water to 52,000 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.

27 other contaminants tested, none detected
  • 11Cl-PF3OUdS
  • 4:2 FTS
  • 6:2 FTS
  • 8:2 FTS
  • 9Cl-PF3ONS
  • ADONA
  • HFPO-DA (GenX)
  • NEtFOSAA
  • NFDHA
  • NMeFOSAA
  • PFDA
  • PFDoA
  • PFEESA
  • PFHpA
  • PFHpS
  • PFHxS
  • PFMBA
  • PFMPA
  • PFNA
  • PFOA
  • PFOS
  • PFPeS
  • PFTA
  • PFTrDA
  • PFUnA
  • Lithium
  • Lead (90th percentile)

Coverage by group

31 results on record
  • PFAS (forever chemicals)4 detected · 25 not detected
  • Metals & lead1 not detected
  • Disinfection by-productsNot monitored
  • Other1 not detected
Track record

0health-based violations in the last 10 years

From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.

Not in this recordDisinfection by-products weren't monitored in this dataset

No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.

What you can do

Test first, then treat what was found

  1. 01 · TestTest your own tap

    A tap test can confirm levels at your home before you choose treatment.

    Certified lab
    How to test your tap →
  2. 02 · PFASReverse osmosis, or carbon certified for PFAS

    PFBS 3.6 ng/L, below the 2000 ng/L EPA health advisory (+3 more PFAS detected)

    NSF/ANSI 58 or 53, with PFBS/PFHxA/PFBA/PFPeA named on the listing
    Treatment for PFAS →

Understand water treatment technologies →

Commercial

No certified match for these concerns yet

Each card names which Rockville findings its current certification covers, and which it doesn't.

As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.

No product in our catalogue has verified certification for these concerns yet.

Questions

Frequently asked questions

Is Rockville tap water safe to drink?

PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Rockville, PFAS were detected below their limits, and PFBA 5.2 ng/L and PFPeA 6.5 ng/L with no federal or state limit. CITY OF ROCKVILLE (PWSID MD0150003) has a Purity Score of 100/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.

Who provides tap water in Rockville?

CITY OF ROCKVILLE (PWS ID MD0150003) is the public water system on record for Rockville, Maryland, serving about 52,000 people. Confirm the utility on your water bill before acting on a specific finding.

Where does Rockville get its drinking water?

Surface water (primary source of record in EPA SDWIS).

Are PFAS "forever chemicals" in Rockville's water?

In EPA's UCMR 5 testing (2023-03-08 to 2023-12-04), PFBS was detected at 3.6 ng/L, below the 2,000 ng/L EPA health advisory and PFHxA was detected at 5.8 ng/L, below the 400,000 ng/L state limit. PFBA (5.2 ng/L) and PFPeA (6.5 ng/L) were also detected; they have no federal or state limit.

Is there lead in Rockville's tap water?

Lead is not in Rockville's current published record. Lead usually enters from a building's own pipes and fixtures, so a certified home test is the way to know yours.

What does the latest Rockville water report show?

PurityMap's current record for Rockville holds 31 findings: 2 detected within the reference, 2 detected with no limit and 27 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.

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Sources and dataAll 31 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule)
ContaminantResultBenchmarkSampledSource
Perfluorobutanesulfonic acid (PFBS)3.6 ng/L2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorohexanoic acid (PFHxA)5.8 ng/L400,000 ng/L Michigan EGLE state MCL (strictest US state)2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorobutanoic acid (PFBA)5.2 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoropentanoic acid (PFPeA)6.5 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
27 other contaminants tested — none detected
ContaminantResultBenchmarkSampledSource
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)< 5 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)< 5 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)< 5 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)< 2 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)< 5 ng/L10 ng/L federal MCL (2024)2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Lead (90th percentile)Non-Detect (ND)15 µg/L federal action level2018–2018 monitoring periodLead & Copper Rule 90th-percentile: CITY OF ROCKVILLE (MD0150003)
Lithium< 9 µg/L10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)< 5 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)< 6 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)< 20 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoro-3-methoxypropanoic acid (PFMPA)< 4 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoro-4-methoxybutanoic acid (PFMBA)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorodecanoic acid (PFDA)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorododecanoic acid (PFDoA)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoroheptanesulfonic acid (PFHpS)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoroheptanoic acid (PFHpA)< 3 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorohexanesulfonic acid (PFHxS)< 3 ng/L10 ng/L federal MCL (2024)2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorononanoic acid (PFNA)< 4 ng/L10 ng/L federal MCL (2024)2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorooctanesulfonic acid (PFOS)< 4 ng/L4.0 ng/L federal MCL (2024)2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorooctanoic acid (PFOA)< 4 ng/L4.0 ng/L federal MCL (2024)2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoropentanesulfonic acid (PFPeS)< 4 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorotetradecanoic acid (PFTA)< 8 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluorotridecanoic acid (PFTrDA)< 7 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)
Perfluoroundecanoic acid (PFUnA)< 2 ng/LNo federal or state limit; shown for transparency2023-03-08 to 2023-12-04UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)

Perfluorobutanesulfonic acid (PFBS)

Result
3.6 ng/L
Benchmark
2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
Sampled
2023-03-08 to 2023-12-04

Perfluorohexanoic acid (PFHxA)

Result
5.8 ng/L
Benchmark
400,000 ng/L Michigan EGLE state MCL (strictest US state)
Sampled
2023-03-08 to 2023-12-04

Perfluorobutanoic acid (PFBA)

Result
5.2 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluoropentanoic acid (PFPeA)

Result
6.5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04
27 other contaminants tested — none detected

11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

4,8-Dioxa-3H-perfluorononanoic acid (ADONA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)

Result
< 2 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)

Result
< 5 ng/L
Benchmark
10 ng/L federal MCL (2024)
Sampled
2023-03-08 to 2023-12-04

Lead (90th percentile)

Result
Non-Detect (ND)
Benchmark
15 µg/L federal action level
Sampled
2018–2018 monitoring period

Lithium

Result
< 9 µg/L
Benchmark
10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
Sampled
2023-03-08 to 2023-12-04

N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)

Result
< 5 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)

Result
< 6 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)

Result
< 20 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluoro-3-methoxypropanoic acid (PFMPA)

Result
< 4 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluoro-4-methoxybutanoic acid (PFMBA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluorodecanoic acid (PFDA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluorododecanoic acid (PFDoA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluoroheptanesulfonic acid (PFHpS)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluoroheptanoic acid (PFHpA)

Result
< 3 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluorohexanesulfonic acid (PFHxS)

Result
< 3 ng/L
Benchmark
10 ng/L federal MCL (2024)
Sampled
2023-03-08 to 2023-12-04

Perfluorononanoic acid (PFNA)

Result
< 4 ng/L
Benchmark
10 ng/L federal MCL (2024)
Sampled
2023-03-08 to 2023-12-04

Perfluorooctanesulfonic acid (PFOS)

Result
< 4 ng/L
Benchmark
4.0 ng/L federal MCL (2024)
Sampled
2023-03-08 to 2023-12-04

Perfluorooctanoic acid (PFOA)

Result
< 4 ng/L
Benchmark
4.0 ng/L federal MCL (2024)
Sampled
2023-03-08 to 2023-12-04

Perfluoropentanesulfonic acid (PFPeS)

Result
< 4 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluorotetradecanoic acid (PFTA)

Result
< 8 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluorotridecanoic acid (PFTrDA)

Result
< 7 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Perfluoroundecanoic acid (PFUnA)

Result
< 2 ng/L
Benchmark
No federal or state limit; shown for transparency
Sampled
2023-03-08 to 2023-12-04

Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.

  • UCMR5 Analytical Results

    UCMR5 Analytical Results: CITY OF ROCKVILLE (MD0150003)

    US EPA

    Published
    2026-01-15
    Newest sample
    2023-12-04
    Findings here
    30

    View source ↗Source record

  • State SDWIS Compliance Record

    Lead & Copper Rule 90th-percentile: CITY OF ROCKVILLE (MD0150003)

    US EPA SDWIS

    Published
    2026-07-09
    Newest sample
    2018
    Findings here
    1

    View source ↗Source record

Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.

Data & methodologyHow we analyze waterData integrity policy

Something off with your water's smell, color or taste?

Start with the hot-or-cold tap check. Where City of Rockville reported something related, it's shown below.