EPA ID NY5110526 · checked 16 Oct 2026
Suffolk County, Long Island tap water: what EPA testing found
Suffolk County Water Authority (EPA record: SUFFOLK COUNTY WATER AUTHORITY) serves 1,100,000 people in NY from ground water.
What the data shows
PFOA and PFOS above EPA’s drinking-water limit
In UCMR 5 testing (2023–2025), PFOA averaged up to 6.05 ng/L (limit 4.0); PFOS averaged up to 12.1 ng/L (limit 4.0) at the worst sampling point. Utilities must meet the limit by 2029 under the current rule; EPA has proposed letting systems ask for until 2031 (not final).
What fits: Pick a filter whose listing certifies PFOA/PFOS (or total PFAS) reduction under NSF/ANSI 53 or 58. Under-sink reverse osmosis units and some carbon filters and pitchers carry it; the certification for the exact model is what counts, not the filter type.
Certified — IAPMO listing, checked 16 Oct 2026- Culligan with ZeroWater Technology 10 Cup PitcherPitcher filter · ZEROP10
- PUR PLUS Lead Reducing Pitcher & Dispenser Replacement FilterPitcher filter · PPF951K
- ZeroWater 5-Stage Replacement FilterPitcher filter · ZR-017
- Culligan Scout 2.25 Gallon Gravity Countertop System with MaxClear…Countertop dispenser · MCSP
- PUR Faucet Filtration System, VerticalFaucet-mount filter · FM-3333B
- PUR PLUS Faucet Filtration System – Horizontal, ChromeFaucet-mount filter · PFM400H
- AquaTru Classic Countertop Reverse Osmosis Water PurifierCountertop reverse osmosis · AT2000
- Aquasana Claryum Direct Connect Under Sink Water FilterUnder-sink filter · AQ-MF-1
- Culligan EZ-Change Under Sink Drinking Water Filtration SystemUnder-sink filter · US-EZ-4
- APEC Water Tankless RO System 4 Stage Water Filter, 1000 GPD Reverse…Under-sink reverse osmosis · ROTL-A1000
- Waterdrop 800 GPD Tankless Reverse Osmosis System - Waterdrop G3P800Under-sink reverse osmosis · WD-G3P800
- Waterdrop G3P600 Reverse Osmosis System - Waterdrop G3P600Under-sink reverse osmosis · WD-G3P600
Brand says certified — not found in IAPMO’s listing; check NSF- Aquasana Clean Water MachineCountertop dispenser · AQ-CWM2-B · check NSF’s listing yourself
- Aquasana Claryum 2-Stage Under Sink Water FilterUnder-sink filter · AQ-6200 · check NSF’s listing yourself
- Aquasana Claryum 3-Stage Max Flow Under Sink Water FilterUnder-sink filter · AQ-6300M · check NSF’s listing yourself
- Aquasana Claryum 3-Stage Under Sink Water FilterUnder-sink filter · AQ-6300 · check NSF’s listing yourself
- A. O. Smith High Efficiency Reverse Osmosis SystemUnder-sink reverse osmosis · AOS-HERO-CHR · check NSF’s listing yourself
- Aquasana SmartFlow Reverse Osmosis Water FilterUnder-sink reverse osmosis · AQ-SFRO2 · check NSF’s listing yourself
- Culligan Aquasential Smart Reverse Osmosis Drinking Water…Under-sink reverse osmosis · Aquasential Smart RO · check NSF’s listing yourself
- Waterdrop Instant Hot Water Dispenser, Reverse Osmosis System, K6Under-sink reverse osmosis · WD-K6-W · check NSF’s listing yourself
- Waterdrop X Series Reverse Osmosis System, X12Under-sink reverse osmosis · WD-X12 · check NSF’s listing yourself
- Aquasana HealthShield Whole House Water Filtration SystemWhole-house filter · WH-HS · check NSF’s listing yourself
NSF’s and WQA’s listings can’t be checked automatically; each product page also links to WQA’s.
Asbestos over the limit
1 health-based violation since 2016, the latest starting 2020-07-01.
What fits: Some carbon-block filters are certified for asbestos reduction under NSF/ANSI 53.
Certified — IAPMO listing, checked 16 Oct 2026- Aquasana Claryum Direct Connect Under Sink Water FilterUnder-sink filter · AQ-MF-1
Brand says certified — not found in IAPMO’s listing; check NSF- Brita Elite Replacement Filter, formerly Longlast+Pitcher filter · OB06 · check NSF’s listing yourself
- Aquasana Clean Water MachineCountertop dispenser · AQ-CWM2-B · check NSF’s listing yourself
- Brita Elite Advanced Water Filter Faucet System with Brita…Faucet-mount filter · FF-100 · check NSF’s listing yourself
- Aquasana SmartFlow Reverse Osmosis Water FilterUnder-sink reverse osmosis · AQ-SFRO2 · check NSF’s listing yourself
- iSpring RCC7AK, NSF Certified 75 GPD, Alkaline 6-Stage Reverse…Under-sink reverse osmosis · RCC7AK · check NSF’s listing yourself
NSF’s and WQA’s listings can’t be checked automatically; each product page also links to WQA’s.
Manganese over the state limit
1 health-based violation since 2016, the latest starting 2018-01-01.
What fits: Some filters list a manganese reduction claim; check the certified claims on the product pages below.
Lead from home plumbing (not in this data)
UCMR 5 does not test for lead, and lead usually enters water from service lines and plumbing inside buildings. Your utility’s lead service line inventory says whether your address is served by a lead line.
What fits: Lead comes from lead service lines, solder and fixtures inside buildings, not usually from the treatment plant. Use a filter certified for lead reduction (NSF/ANSI 53 or 58) at the tap you drink from.
Certified — IAPMO listing, checked 16 Oct 2026- Brita Elite Replacement Filter, formerly Longlast+Pitcher filter · OB06
- Culligan with ZeroWater Technology 10 Cup PitcherPitcher filter · ZEROP10
- PUR PLUS Lead Reducing Pitcher & Dispenser Replacement FilterPitcher filter · PPF951K
- ZeroWater 5-Stage Replacement FilterPitcher filter · ZR-017
- Culligan Scout 2.25 Gallon Gravity Countertop System with MaxClear…Countertop dispenser · MCSP
- PUR Faucet Filtration System, VerticalFaucet-mount filter · FM-3333B
- PUR PLUS Faucet Filtration System – Horizontal, ChromeFaucet-mount filter · PFM400H
- AquaTru Classic Countertop Reverse Osmosis Water PurifierCountertop reverse osmosis · AT2000
- Aquasana Claryum Direct Connect Under Sink Water FilterUnder-sink filter · AQ-MF-1
- Culligan EZ-Change Under Sink Drinking Water Filtration SystemUnder-sink filter · US-EZ-4
- Waterdrop 800 GPD Tankless Reverse Osmosis System - Waterdrop G3P800Under-sink reverse osmosis · WD-G3P800
- Waterdrop G3P600 Reverse Osmosis System - Waterdrop G3P600Under-sink reverse osmosis · WD-G3P600
Brand says certified — not found in IAPMO’s listing; check NSF- LifeStraw Home 7-Cup Glass Water Filter PitcherPitcher filter · LSH7SPC101 · check NSF’s listing yourself
- Aquasana Clean Water MachineCountertop dispenser · AQ-CWM2-B · check NSF’s listing yourself
- Brita Elite Advanced Water Filter Faucet System with Brita…Faucet-mount filter · FF-100 · check NSF’s listing yourself
- Brita Hub Countertop Water Filter System with Brita Hub FilterCountertop filter · 87340 · check NSF’s listing yourself
- Aquasana Claryum 2-Stage Under Sink Water FilterUnder-sink filter · AQ-6200 · check NSF’s listing yourself
- Aquasana Claryum 3-Stage Max Flow Under Sink Water FilterUnder-sink filter · AQ-6300M · check NSF’s listing yourself
- Aquasana Claryum 3-Stage Under Sink Water FilterUnder-sink filter · AQ-6300 · check NSF’s listing yourself
- A. O. Smith High Efficiency Reverse Osmosis SystemUnder-sink reverse osmosis · AOS-HERO-CHR · check NSF’s listing yourself
- APEC Water Tankless RO System 4 Stage Water Filter, 1000 GPD Reverse…Under-sink reverse osmosis · ROTL-A1000 · check NSF’s listing yourself
- APEC Water Ultimate 5-Stage 90 GPD High Output Reverse Osmosis Water…Under-sink reverse osmosis · RO-90 · check NSF’s listing yourself
- Aquasana SmartFlow Reverse Osmosis Water FilterUnder-sink reverse osmosis · AQ-SFRO2 · check NSF’s listing yourself
- Culligan Aquasential Smart Reverse Osmosis Drinking Water…Under-sink reverse osmosis · Aquasential Smart RO · check NSF’s listing yourself
- iSpring RCC7AK, NSF Certified 75 GPD, Alkaline 6-Stage Reverse…Under-sink reverse osmosis · RCC7AK · check NSF’s listing yourself
- Waterdrop X Series Reverse Osmosis System, X12Under-sink reverse osmosis · WD-X12 · check NSF’s listing yourself
NSF’s and WQA’s listings can’t be checked automatically; each product page also links to WQA’s.
PFAS and lithium (EPA UCMR 5)
14,418 results from 242 sampling points, 3 Jan 2023 to 29 Sep 2025. Averages count results below EPA’s reporting level as zero, as the PFAS rule does. Every number links to EPA’s UCMR 5 Data Finder (search PWSID NY5110526). Limits: EPA PFAS rule.
| Contaminant | Detected in | Highest result | Average | EPA limit |
|---|---|---|---|---|
| PFOA | 19 of 480 | 6.5 ng/L | 0.21 ng/L | 4 ng/L |
| PFOS | 13 of 480 | 17.4 ng/L | 0.17 ng/L | 4 ng/L |
| PFHxS | 19 of 480 | 10.8 ng/L | 0.19 ng/L | 10 ng/L* |
| PFNA | 2 of 480 | 5.7 ng/L | 0.02 ng/L | 10 ng/L* |
| HFPO-DA | 0 of 480 | not detected | 0 ng/L | 10 ng/L* |
| PFBS | 5 of 480 | 5.2 ng/L | 0.04 ng/L | none |
| PFBA | 9 of 480 | 12.6 ng/L | 0.14 ng/L | none |
| PFHxA | 45 of 480 | 43.5 ng/L | 0.67 ng/L | none |
| PFHpA | 4 of 480 | 9.6 ng/L | 0.05 ng/L | none |
| PFPeA | 53 of 480 | 39.4 ng/L | 0.85 ng/L | none |
| 6:2 FTS | 2 of 480 | 23.6 ng/L | 0.08 ng/L | none |
| Lithium | 0 of 482 | not detected | 0 µg/L | none (screening level 10 µg/L) |
* PFHxS, PFNA and HFPO-DA limits (and the PFAS hazard index) are in the rule, but EPA proposed on 20 May 2026 to rescind them; not final as of 16 Oct 2026. UCMR 5 results are screening data, not compliance results: compliance uses quarterly running averages from 2029. Source file: EPA UCMR 5 occurrence data (dated 15 Oct 2026).
Sampling points averaging above a limit
| Facility | Water | Samples | PFOA avg | PFOS avg | Above |
|---|---|---|---|---|---|
| Station Rd. Int. Wellfield | ground | 2 | 4.95 ng/L | 12.1 ng/L | PFOA, PFOS |
| Boyle Rd. South Wellfield | ground | 2 | 5.75 ng/L | 2.45 ng/L | PFOA |
| Dare Rd. Wellfield | ground | 2 | 2.6 ng/L | 4.6 ng/L | PFOS |
| Horseblock Rd. Int. Wellfield | ground | 2 | 6.05 ng/L | 0 ng/L | PFOA |
| William Floyd Pkwy. Wellfield | ground | 2 | 0 ng/L | 5.55 ng/L | PFOS |
| Pierson St. Wellfield | ground | 2 | 5.4 ng/L | 0 ng/L | PFOA |
| Wheat Path Wellfield | ground | 2 | 5.4 ng/L | 0 ng/L | PFOA |
| Hallock Ave. Wellfield | ground | 2 | 0 ng/L | 4.7 ng/L | PFOS |
| Daniel Webster Dr. Wellfield | ground | 2 | 4.7 ng/L | 0 ng/L | PFOA |
| St. Johnsland Road Wellfield | ground | 2 | 4.55 ng/L | 0 ng/L | PFOA |
Health-based violations since 2016
| Period began | Contaminant or rule | Violation | Measured | Status |
|---|---|---|---|---|
| 1 Jul 2020 | Asbestos | Maximum Contaminant Level Violation, Average | 26.6 mfl | Returned to Compliance (3 Sep 2020) |
| 1 Jan 2018 | Manganese | Maximum Contaminant Level Violation, Average | 0.5 mg/l | Returned to Compliance (31 May 2019) |
Source: EPA SDWIS via Envirofacts and the ECHO report for NY5110526, retrieved 16 Oct 2026.
Hardness
6.8 grains per gallon (highest area figure of 30, 2025; varies by area), from the utility’s water report checked 16 Oct 2026. Size a softener for this water.
| Plant, source or area | Serves | Grains per gallon |
|---|---|---|
| Distribution Area 1 | – | 2.13 (0.13–10.5) |
| Distribution Area 5 | – | 6.64 (2.82–11) |
| Distribution Area 6 | – | 4.58 (1.45–8.68) |
| Distribution Area 7 | – | 5.88 (4.19–6.71) |
| Distribution Area 8 | – | 1.99 (0.95–3.02) |
| Distribution Area 9 | – | 5.94 (3.72–8.13) |
| Distribution Area 10 | – | 4.25 (2.37–6.64) |
| Distribution Area 11 | – | 4.85 (1.92–9.78) |
| Distribution Area 12 | – | 4.24 (0.66–11.6) |
| Distribution Area 14 | – | 1.56 (0.75–3.17) |
| Distribution Area 15 | – | 4.43 (0.38–9.85) |
| Distribution Area 23 | – | 4.72 (0.98–9.85) |
| Distribution Area 26 | – | 4.89 (1.76–11) |
| Distribution Area 30 | – | 6.76 (2.58–12.4) |
| Distribution Area 32 | – | 3.18 (2.41–3.73) |
| Distribution Area 34 | – | 2.7 (2.1–3.51) |
| Distribution Area 35 | – | 6.44 (5.05–7.04) |
| Distribution Area 44 | – | 3.43 (3.09–3.91) |
| Distribution Area 57 | – | 3.71 (2.56–5.09) |
| Distribution Area 64 | – | 2.96 (2.58–3.73) |
| Distribution Area 65 | – | 1.6 (1.49–1.83) |
| Distribution Area 67 | – | 0.52 (0.33–0.73) |
| Distribution Area 68 | – | 1.37 (0.12–3.02) |
| Distribution Area EFWD | – | 0.85 (0.13–2.05) |
| Distribution Area RSWD | – | 2.01 (2–2.01) |
| Distribution Area SBWD | – | 2.41 (1.21–3.91) |
| Distribution Area WNWD | – | 2.16 (1.24–2.76) |
From the same report. Which plant or source serves an address depends on where it is; the utility’s report explains its areas.
79 of this system’s ZIP codes are placed in a plant’s service area using the utility’s service-area map (checked 17 Oct 2026); the ZIP checker shows your ZIP code’s figure.
Places and ZIP codes served
Amityville, Babylon, Bay Shore, Bayport, Bellport, Bohemia, Brentwood, Brookhaven, Center Moriches, Centereach, Centerport, Central Islip, Cold Spring Harbor, Commack, Copiague, Coram, Cutchogue, Deer Park, East Hampton, East Islip, East Marion, East Northport, East Quogue, East Setauket, Eastport, Farmingdale, Farmingville, Greenport, Hauppauge, Holbrook, Holtsville, Huntington, Huntington Station, Islandia, Islip, Islip Terrace, Kings Park, Lake Grove, Lindenhurst, Manorville, Mastic, Mattituck, Medford, Middle Island, Miller Place, Montauk, Mount Sinai, Nesconset, North Babylon, Northport, Oakdale, Ocean Beach, Orient, Patchogue, Peconic, Port Jefferson, Port Jefferson Station, Ridge, Riverhead, Rocky Point, Ronkonkoma, Sag Harbor, Saint James, Sayville, Selden, Shelter Island, Shelter Island Heights, Shirley, Shoreham, Smithtown, Southampton, Southold, Stony Brook, Water Mill, West Babylon, West Islip, Westhampton Beach, Wyandanch, Yaphank.
11701 11702 11703 11704 11705 11706 11713 11716 11717 11719 11720 11721 11722 11724 11725 11726 11727 11729 11730 11731 11733 11735 11738 11741 11742 11743 11746 11749 11751 11752 11754 11755 11757 11763 11764 11766 11767 11768 11769 11770 11772 11776 11777 11778 11779 11780 11782 11784 11786 11787 11788 11790 11795 11798 11901 11934 11935 11937 11939 11941 11942 11944 11949 11950 11952 11953 11954 11957 11958 11961 11963 11964 11965 11967 11968 11971 11976 11978 11980
ZIP codes the system reported to EPA for UCMR 5; place names from GeoNames (CC BY 4.0). A ZIP code can be split between systems.