PFOA
2.7× the limitPerfluorooctanoic acid
10.9ng/L
Each block = 4.0 ng/L federal MCL (2024)
EPA UCMR 5 · sampled 2023Evidence
City water report · 2026
Is Stamford Tap Water Safe? 2026 Water Quality Report
Short answer: Two PFAS, PFOA and PFOS, are above their federal limits (2024 limits that water systems have until at least 2029 to meet); 3 more are detected with no federal limit, and everything else measured is within its reference or not detected. Aquarion-Eastern Fairfield County serves 351,756 residents.
Likely match, check your bill
5 water systems report serving Stamford
This report uses the largest, AQUARION-EASTERN FAIRFIELD COUNTY. Your water bill or annual water quality report names your actual supplier.
- Source
- Surface water
- Lead service lines
- 3,948 lead, 323 galvanized, 63,008 unknown
Source: EPA SDWIS 2026Q2.
- AQUARION-EASTERN FAIRFIELD COUNTYThis reportCT0150011 · 351,756 served
- AQUARION-STAMFORDCT1350011 · 119,214 served · EPA record for AQUARION-STAMFORD (opens in a new tab)
- AQUARION-GREENWICHCT0570011 · 53,297 served · EPA record for AQUARION-GREENWICH (opens in a new tab)
- AQUARION-DARIENCT0350011 · 18,737 served · EPA record for AQUARION-DARIEN (opens in a new tab)
- AQUARION-NEW CANAANCT0900011 · 10,097 served · EPA record for AQUARION-NEW CANAAN (opens in a new tab)
Your water utility
Aquarion Water Company (Eastern Fairfield County): contact and record
What stands out
Two PFAS above the 2024 federal limit
Each 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.
PFOS
1.6× the limitPerfluorooctanesulfonic acid
6.6ng/L
Each block = 4.0 ng/L federal MCL (2024)
EPA UCMR 5 · sampled 2023Evidence
Coverage by group
31 results on record- PFAS (forever chemicals)2 above · 5 detected · 22 not detected
- Metals & lead1 not detected
- Disinfection by-productsNot monitored
- Other1 not detected
Every detected result
7 detected results, by distance from their limit
AQUARION-EASTERN FAIRFIELD COUNTY (EPA PWSID CT0150011) delivers surface water to 351,756 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 · 20234.0 ng/L federal MCL (2024)10.9ng/LAbove limit
- Perfluorooctanesulfonic acid (PFOS)EPA UCMR 5 · 20234.0 ng/L federal MCL (2024)6.6ng/LAbove limit
- Perfluorobutanesulfonic acid (PFBS)EPA UCMR 5 · 20232,000 ng/L EPA health advisory (screening, not a legal limit)4.1ng/LWithin reference
- Perfluorohexanoic acid (PFHxA)EPA UCMR 5 · 2023400,000 ng/L Michigan EGLE state MCL (strictest US state)7.4ng/LWithin reference
- Perfluorobutanoic acid (PFBA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency7.6ng/LDetected · no limit
- Perfluoroheptanoic acid (PFHpA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency3.9ng/LDetected · no limit
- Perfluoropentanoic acid (PFPeA)EPA UCMR 5 · 2023No federal or state limit; shown for transparency6.7ng/LDetected · no limit
24 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
- PFHpS
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFPeS
- PFTA
- PFTrDA
- PFUnA
- Lithium
- Lead (90th percentile)
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
- 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 10.9 ng/L, above the 4 ng/L limit (+6 more PFAS detected)
NSF/ANSI 58 or 53, with PFOA/PFOS/PFBS/PFHxA/PFBA/PFHpA/PFPeA named on the listingTreatment for PFAS → - 03 · LeadLead-certified carbon filter, or reverse osmosis
3,948 lead service lines; 323 galvanized lines 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 Stamford 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
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA) and 2 more
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
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA) and 2 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
See all 9 products certified for a Stamford concern →
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA) and 2 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 Reverse-Osmosis System
- PFOA: eligible, evidence match
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA) and 2 more
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
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA) and 2 more
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
- PFOS: eligible, evidence match
- Lead: eligible, evidence match
- Not established: Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorobutanoic acid (PFBA) and 2 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
Water Pitcher
Culligan ZeroWater 10-Cup Pitcher (ZEROP10)
- Lead: eligible, evidence match
- Not established: PFOA, PFOS, Perfluorobutanesulfonic acid (PFBS) and 4 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, PFOS, Perfluorobutanesulfonic acid (PFBS) and 4 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, PFOS, Perfluorobutanesulfonic acid (PFBS) and 4 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 Stamford tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Stamford, PFOA 10.9 ng/L and PFOS 6.6 ng/L were measured above the 4 ng/L federal limit in EPA's 2024 testing. AQUARION-EASTERN FAIRFIELD COUNTY (PWSID CT0150011) has a Purity Score of 57/100 (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 Stamford?
AQUARION-EASTERN FAIRFIELD COUNTY (PWS ID CT0150011) is the public water system on record for Stamford, Connecticut, serving about 351,756 people. Confirm the utility on your water bill before acting on a specific finding.
Where does Stamford get its drinking water?
Surface water (primary source of record in EPA SDWIS).
Are PFAS "forever chemicals" in Stamford's water?
Yes. In EPA's UCMR 5 testing (2023-01-17 to 2024-02-20), PFOA was measured at 10.9 ng/L against a 4 ng/L federal limit and PFOS was measured at 6.6 ng/L against a 4 ng/L federal limit. PFBS (4.1 ng/L, below the 2,000 ng/L EPA health advisory) and PFHxA (7.4 ng/L, below the 400,000 ng/L state limit) were also detected. PFBA (7.6 ng/L), PFHpA (3.9 ng/L) and PFPeA (6.7 ng/L) were also detected; they have 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 Stamford's tap water?
Lead is not in Stamford'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 Stamford water report show?
PurityMap's current record for Stamford holds 31 findings: 2 above a reference, 2 detected within the reference, 3 detected with no limit and 24 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 Stamford'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)
24 other contaminants tested — none detected
- Result
- 10.9 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Sampled
- 2023-01-17 to 2024-02-20
Perfluorooctanesulfonic acid (PFOS)
- Result
- 6.6 ng/L
- Benchmark
- 4.0 ng/L federal MCL (2024)
- Sampled
- 2023-01-17 to 2024-02-20
Perfluorobutanesulfonic acid (PFBS)
- Result
- 4.1 ng/L
- Benchmark
- 2,000 ng/L EPA health advisory (screening, not a legal limit)Screening level, not a legal limit
- Sampled
- 2023-01-17 to 2024-02-20
Perfluorohexanoic acid (PFHxA)
- Result
- 7.4 ng/L
- Benchmark
- 400,000 ng/L Michigan EGLE state MCL (strictest US state)
- Sampled
- 2023-01-17 to 2024-02-20
- Result
- 7.6 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluoroheptanoic acid (PFHpA)
- Result
- 3.9 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluoropentanoic acid (PFPeA)
- Result
- 6.7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
24 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
- 2023-01-17 to 2024-02-20
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Result
- < 5 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2023-01-17 to 2024-02-20
- 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
- 2023-01-17 to 2023-10-03
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- Result
- < 5 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2023-10-03
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Result
- < 6 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2023-10-03
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Result
- < 20 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluoro-3-methoxypropanoic acid (PFMPA)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluoro-4-methoxybutanoic acid (PFMBA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluorododecanoic acid (PFDoA)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluoroheptanesulfonic acid (PFHpS)
- Result
- < 3 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluorohexanesulfonic acid (PFHxS)
- Result
- < 3 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2023-01-17 to 2024-02-20
- Result
- < 4 ng/L
- Benchmark
- 10 ng/L federal MCL (2024)
- Sampled
- 2023-01-17 to 2024-02-20
Perfluoropentanesulfonic acid (PFPeS)
- Result
- < 4 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
Perfluorotetradecanoic acid (PFTA)
- Result
- < 8 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2023-10-03
Perfluorotridecanoic acid (PFTrDA)
- Result
- < 7 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2023-10-03
Perfluoroundecanoic acid (PFUnA)
- Result
- < 2 ng/L
- Benchmark
- No federal or state limit; shown for transparency
- Sampled
- 2023-01-17 to 2024-02-20
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: AQUARION-EASTERN FAIRFIELD COUNTY (CT0150011)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: AQUARION-EASTERN FAIRFIELD COUNTY (CT0150011)
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 Aquarion-Eastern Fairfield County reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at Aquarion-Eastern Fairfield County: not detected (90th percentile, 2026 monitoring period (still open)). Lead has no taste, so a taste neither shows nor rules it out.