PFOA
2.3× the limitPerfluorooctanoic acid
9ng/L
Each block = 4.0 ng/L federal MCL (2024)
EPA UCMR 5 · sampled 2024Evidence
Water system record · NH1201010
Hudson Water Dept
Hudson Water Dept serves 16,700 people from groundwater. 31 results are on record. 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.
- Source
- Groundwater Serves 1 city area on record.
- Population
- 16,700 as reported to EPA
- Type
- Community Water System New Hampshire
- Cities
- 1 Hudson
- Records
- 31 results latest 2024
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 · 2 detected · 26 not detected
- Metals & lead1 not detected
- Disinfection by-productsNot monitored
- Other1 not detected
Every detected result
3 detected results, by distance from their limit
- Perfluorooctanoic acid (PFOA)EPA UCMR 5 · 20244.0 ng/L federal MCL (2024)9ng/LAbove limit
- Perfluorohexanoic acid (PFHxA)EPA UCMR 5 · 2024400,000 ng/L Michigan EGLE state MCL (strictest US state)4ng/LWithin reference
- Perfluoropentanoic acid (PFPeA)EPA UCMR 5 · 2024No federal or state limit; shown for transparency5ng/LDetected · no limit
28 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
- PFBS
- PFDA
- PFDoA
- PFEESA
- PFHpA
- PFHpS
- PFHxS
- PFMBA
- PFMPA
- PFNA
- PFOS
- PFPeS
- PFTA
- PFTrDA
- PFUnA
- Lithium
- Lead (90th percentile)
Compliance and coverage
Compliance
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.
A federal limit (an MCL or action level) is an enforceable legal cap; a health goal is often stricter. Meeting the limit is a compliance fact, not a health clearance, and PurityMap publishes no overall compliance verdict.
What you can do
Test first, then treat what was found
- 01 · TestTest your own tap
A tap test can confirm levels at your home before you choose treatment.
Certified labHow to test your tap → - 02 · Treat PFASReverse osmosis, or carbon certified for PFAS
PFOA 9 ng/L, above the 4 ng/L limit (+2 more PFAS detected)
NSF/ANSI 58 or 53, with PFOA/PFHxA/PFPeA named on the listingTreatment for PFAS →
Understand water treatment technologies →
Understand:PFAS in Hudson
Commercial
Certified for a concern found here
Each card names which of this system’s 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 2-Stage Under-Sink Filter (AQ-5200)
- PFOA: eligible, evidence match
- Not established: 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
Aquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M)
- PFOA: eligible, evidence match
- Not established: 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
See all 9 products certified for a concern in this system →
Countertop System
Aquasana Clean Water Machine Countertop Filter (AQ-CWM2)
- PFOA: eligible, evidence match
- Not established: 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
Countertop System
Patriot Pure Ultimate Water Filtration System
- PFOA: eligible, evidence match
- Not established: 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
Countertop System
AquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100)
- PFOA: eligible, evidence match
- Not established: 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
Countertop System
AquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000)
- PFOA: eligible, evidence match
- Not established: 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
Waterdrop G3P600 Tankless Reverse-Osmosis System
- PFOA: eligible, evidence match
- Not established: 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 G3P800 Tankless Reverse-Osmosis System
- PFOA: eligible, evidence match
- Not established: 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
- Not established: 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
Questions
Frequently asked questions
Who does HUDSON WATER DEPT serve?
HUDSON WATER DEPT (PWS ID NH1201010) is a public water system serving 16,700 people in Hudson, New Hampshire.
Where does HUDSON WATER DEPT get its water?
HUDSON WATER DEPT is on record as drawing from groundwater. The source shapes which contaminants matter most for this system.
What does HUDSON WATER DEPT's monitoring record show?
PurityMap's record for HUDSON WATER DEPT holds 31 findings: 1 above a reference, 1 detected within the reference, 1 detected with no limit and 28 not detected, from 31 evidence records. Every finding links to its source; a substance that was never monitored is shown as pending, not as a pass.
Is HUDSON WATER DEPT's water safe to drink?
PurityMap does not issue a safety verdict. It publishes HUDSON WATER DEPT's measured results against each contaminant's benchmark so you can read them in context. Safety depends on the specific finding, your plumbing, and how the water reaches your tap.
How current is this HUDSON WATER DEPT data?
The latest published record for HUDSON WATER DEPT is dated 2026-09-16. Utilities report on regulatory cycles, so results reflect the monitoring period rather than a live reading.
Does this assessment represent my home's tap water?
No. It is assessed at the water-system level from HUDSON WATER DEPT's own monitoring. It does not cover the service line to your building or the plumbing inside it, which can add lead and other metals after the water leaves the system. A tap test is the way to know what reaches your glass.
What contaminants were detected in HUDSON WATER DEPT?
Perfluorooctanoic acid (PFOA), Perfluorohexanoic acid (PFHxA) and Perfluoropentanoic acid (PFPeA) were detected in this record. Each finding shows its measured value, its reference and its source on this page.
What should I do if I'm concerned about PFAS in HUDSON WATER DEPT's water?
Start with what the record shows: the PFAS findings above list each measured value against its reference. This record cannot show your home's plumbing, so a tap test tells you what reaches your glass. If you decide to treat your water, look for a filter whose certification covers the specific PFAS compounds in your record; the section "Certified for a concern found here" lists only products with a current certification record for these concerns.
Follow this water
Follow Hudson Water Dept
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Cities served by this system
As listed for this system in EPA's records. Your water bill names your supplier.
Sources and dataAll 31 records and their sourcesEPA UCMR 5 · EPA SDWIS (Lead & Copper Rule)
| Substance | Result | Reference | Sampled | Status | Evidence |
|---|---|---|---|---|---|
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L | 10 ng/L federal MCL (2024) | 2024-07-31 to 2025-01-14 | Not detected | — |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-02 | Not detected | — |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-02 | Not detected | — |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluorohexanoic acid (PFHxA) | 4 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2024-07-31 to 2025-01-14 | Below limit | View evidence |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L | 10 ng/L federal MCL (2024) | 2024-07-31 to 2025-01-14 | Not detected | View evidence |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluorononanoic acid (PFNA) | < 4 ng/L | 10 ng/L federal MCL (2024) | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluorooctanoic acid (PFOA) | 9 ng/L | 4.0 ng/L federal MCL (2024) | 2024-07-31 to 2025-01-14 | Above guideline | View evidence |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L | 4.0 ng/L federal MCL (2024) | 2024-07-31 to 2025-01-14 | Not detected | View evidence |
| Perfluoropentanoic acid (PFPeA) | 5 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Detected, no limit | View evidence |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-02 | Not detected | — |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-02 | Not detected | — |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L | No federal or state limit; shown for transparency | 2024-07-31 to 2025-01-14 | Not detected | — |
| Lithium | < 9 µg/L | 10 µg/L EPA health reference level (screening, not a legal limit) | 2024-07-31 to 2025-01-02 | Not detected | — |
| Lead (90th percentile) | Non-Detect (ND) | 15 µg/L federal action level | 2024–2024 monitoring period | Not detected | View evidence |
UCMR5 Analytical Results
UCMR5 Analytical Results: HUDSON WATER DEPT (NH1201010)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: HUDSON WATER DEPT (NH1201010)
US EPA SDWIS