PFOA
1.4× the limitPerfluorooctanoic acid
5.4ng/L
Each block = 4.0 ng/L federal MCL (2024)
EPA UCMR 5 · sampled 2024Evidence
City water report · 2026
Is Danbury Tap Water Safe? 2026 Water Quality Report
Short answer: PFOA is above its federal limit (a 2024 limit that water systems have until at least 2029 to meet); 1 more is detected with no federal limit, and everything else measured is within its reference or not detected. Danbury Water Department serves 62,055 residents.
Likely match, check your bill
2 water systems report serving Danbury
This report uses the largest, DANBURY WATER DEPARTMENT. Your water bill or annual water quality report names your actual supplier.
- Source
- Surface water
- Lead service lines
- 0 lead, 1 galvanized, 9,111 unknown
Source: EPA SDWIS 2026Q2.
- DANBURY WATER DEPARTMENTThis reportCT0340011 · 62,055 served
- BETHEL WATER DEPTCT0090011 · 9,507 served · EPA record for BETHEL WATER DEPT (opens in a new tab)
What stands out
One PFAS above the 2024 federal limit
The bar is drawn in blocks of the 4.0 ng/L federal MCL (2024), so the length shows how far above it the result sits.
Coverage by group
31 results on record- PFAS (forever chemicals)1 above · 3 detected · 25 not detected
- Metals & lead1 not detected
- Disinfection by-productsNot monitored
- Other1 not detected
Every detected result
4 detected results, by distance from their limit
DANBURY WATER DEPARTMENT (EPA PWSID CT0340011) delivers surface water to 62,055 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.
- Perfluorooctanoic acid (PFOA)EPA UCMR 5 · 20244.0 ng/L federal MCL (2024)5.4ng/LAbove limit
- Perfluorobutanesulfonic acid (PFBS)EPA UCMR 5 · 20242,000 ng/L EPA health advisory (screening, not a legal limit)4.3ng/LWithin reference
- Perfluorohexanoic acid (PFHxA)EPA UCMR 5 · 2024400,000 ng/L Michigan EGLE state MCL (strictest US state)3.6ng/LWithin reference
- Perfluoropentanoic acid (PFPeA)EPA UCMR 5 · 2024No federal or state limit; shown for transparency3.4ng/LDetected · no limit
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
- PFBA
- PFDA
- PFDoA
- PFEESA
- PFHpA
- PFHpS
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFOS
- PFPeS
- PFTA
- PFTrDA
- PFUnA
- Lithium
- Lead (90th percentile)
Track record
1health-based violation in the last 10 years
From EPA SDWIS. Counted once per contaminant per year, as in the Track record score.
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.
Health-based violations, last 10 years
Every filing is listed; the Track record score counts at most one per contaminant per year.
- Interim Enhanced Surface Water Treatment Rule
Resolved
- Interim Enhanced Surface Water Treatment RuleTT
to Resolved
What you can do
Test first, then treat what was found
- 01 · TestTest your own tap
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
Certified labHow to test your tap → - 02 · Treat PFASReverse osmosis, or carbon certified for PFAS
PFOA 5.4 ng/L, above the 4 ng/L limit (+3 more PFAS detected)
NSF/ANSI 58 or 53, with PFOA/PFBS/PFHxA/PFPeA named on the listingTreatment for PFAS → - 03 · LeadLead-certified carbon filter, or reverse osmosis
1 galvanized line to replace
NSF/ANSI 53 (lead)Treatment for Lead →
Test your own tap
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Safe Home DIY Lead in Drinking Water Combo Test Kit
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
- Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Labs Basic Water Quality Test Kit
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
- Analyzed by Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638
- Turnaround: 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Commercial
Certified for a concern found here
Each card names which Danbury 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.
Under-Sink Filter
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
See all 9 products certified for a Danbury concern →
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Under-Sink Filter
Under-Sink Reverse-Osmosis System
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Under-Sink Filter
Waterdrop G3P600 Tankless Reverse-Osmosis System
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (5)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
- Renters who can't modify plumbing
Refrigerator Filter
Whirlpool Filter 3 Refrigerator Water Filter (WHR3RXD1)
- PFOA: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluoropentanoic acid (PFPeA)
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Water Pitcher
Culligan ZeroWater 10-Cup Pitcher (ZEROP10)
- Lead: eligible, evidence match
- Not established: PFOA, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 1 more
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Faucet Attachment
Faucet-Mount Filter
- Lead: eligible, evidence match
- Not established: PFOA, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 1 more
Not suitable for (3)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
Under-Sink Filter
Under-Sink Carbon Block Filter
- Lead: eligible, evidence match
- Not established: PFOA, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA) and 1 more
Not suitable for (4)
- Treating every tap in the home
- A whole-home hard-water or scale problem
- All PFAS: its evidence covers only the compounds it names
- Anyone who can't plumb, drill or hire an installer
Questions
Frequently asked questions
Is Danbury tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Danbury, PFOA 5.4 ng/L was measured above the 4 ng/L federal limit in EPA's 2024 testing. DANBURY WATER DEPARTMENT (PWSID CT0340011) has a Purity Score of 70/100 (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 Danbury?
DANBURY WATER DEPARTMENT (PWS ID CT0340011) is the public water system on record for Danbury, Connecticut, serving about 62,055 people. Confirm the utility on your water bill before acting on a specific finding.
Where does Danbury get its drinking water?
Surface water (primary source of record in EPA SDWIS).
Are PFAS "forever chemicals" in Danbury's water?
Yes. In EPA's UCMR 5 testing (2024-12-10 to 2025-09-17), PFOA was measured at 5.4 ng/L against a 4 ng/L federal limit. PFBS (4.3 ng/L, below the 2,000 ng/L EPA health advisory) and PFHxA (3.6 ng/L, below the 400,000 ng/L state limit) were also detected. PFPeA (3.4 ng/L) was also detected; it has no federal or state limit. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap.
Is there lead in Danbury's tap water?
Lead is not in Danbury'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 Danbury water report show?
PurityMap's current record for Danbury holds 31 findings: 1 above a reference, 2 detected within the reference, 1 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.
Follow this water
Follow Danbury's water
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.
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Sources and dataAll 31 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule)
| Contaminant | Result | Benchmark | Sampled | Source |
|---|---|---|---|---|
| Perfluorooctanoic acid (PFOA) | 5.4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-12-10 to 2025-09-17 | UCMR5 Analytical Results: DANBURY WATER DEPARTMENT (CT0340011) |
| Perfluorobutanesulfonic acid (PFBS) | 4.3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit | 2024-12-10 to 2025-09-17 | UCMR5 Analytical Results: DANBURY WATER DEPARTMENT (CT0340011) |
| Perfluorohexanoic acid (PFHxA) | 3.6 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2024-12-10 to 2025-09-17 | UCMR5 Analytical Results: DANBURY WATER DEPARTMENT (CT0340011) |
| Perfluoropentanoic acid (PFPeA) | 3.4 ng/L | No federal or state limit; shown for transparency | 2024-12-10 to 2025-09-17 | UCMR5 Analytical Results: DANBURY WATER DEPARTMENT (CT0340011) |
27 other contaminants tested — none detected
- Result
- 5.4 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Sampled
- 2024-12-10 to 2025-09-17
Perfluorobutanesulfonic acid (PFBS)
- Result
- 4.3 ng/L
- Benchmark
- 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
- Sampled
- 2024-12-10 to 2025-09-17
Perfluorohexanoic acid (PFHxA)
- Result
- 3.6 ng/L
- Benchmark
- 400,000 ng/L Michigan EGLE state MCL (strictest US state)
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoropentanoic acid (PFPeA)
- Result
- 3.4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
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
- 2024-12-10 to 2025-09-17
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Result
- < 5 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2024-12-10 to 2025-09-17
- Result
- Non-Detect (ND)
- Benchmark
- 15 µg/L federal action level
- Sampled
- 2026–2026 monitoring period (still open)
- Result
- < 9 µg/L
- Benchmark
- 10 µg/L EPA health reference level (screening, not a legal limit)Screening level, not a legal limit
- Sampled
- 2024-12-10 to 2025-09-17
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Result
- < 6 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Result
- < 20 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoro-3-methoxypropanoic acid (PFMPA)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoro-4-methoxybutanoic acid (PFMBA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluorododecanoic acid (PFDoA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoroheptanesulfonic acid (PFHpS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoroheptanoic acid (PFHpA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluorohexanesulfonic acid (PFHxS)
- Result
- < 3 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2024-12-10 to 2025-09-17
- Result
- < 4 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2024-12-10 to 2025-09-17
Perfluorooctanesulfonic acid (PFOS)
- Result
- < 4 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoropentanesulfonic acid (PFPeS)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluorotetradecanoic acid (PFTA)
- Result
- < 8 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluorotridecanoic acid (PFTrDA)
- Result
- < 7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
Perfluoroundecanoic acid (PFUnA)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2024-12-10 to 2025-09-17
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: DANBURY WATER DEPARTMENT (CT0340011)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: DANBURY WATER DEPARTMENT (CT0340011)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Something off with your water's smell, color or taste?
Start with the hot-or-cold tap check. Where Danbury Water Department reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at Danbury Water Department: not detected (90th percentile, 2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.