EPA ID MD0150005 · checked 16 Oct 2026
Montgomery and Prince George’s counties tap water: what EPA testing found
WSSC Water (Washington Suburban Sanitary Commission) (EPA record: WASHINGTON SUBURBAN SANITARY COMMISSION) serves 1,900,000 people in MD from surface water.
What the data shows
PFAS found, below EPA’s limits (PFHxA, PFPeA)
2 PFAS compounds reached EPA’s reporting level in at least one sample; no sampling point averaged above a limit.
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.
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)
240 results from 2 sampling points, 27 Mar 2023 to 10 Jun 2024. 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 MD0150005). Limits: EPA PFAS rule.
| Contaminant | Detected in | Highest result | Average | EPA limit |
|---|---|---|---|---|
| PFOA | 0 of 8 | not detected | 0 ng/L | 4 ng/L |
| PFOS | 0 of 8 | not detected | 0 ng/L | 4 ng/L |
| PFHxS | 0 of 8 | not detected | 0 ng/L | 10 ng/L* |
| PFNA | 0 of 8 | not detected | 0 ng/L | 10 ng/L* |
| HFPO-DA | 0 of 8 | not detected | 0 ng/L | 10 ng/L* |
| PFHxA | 4 of 8 | 4.8 ng/L | 2.11 ng/L | none |
| PFPeA | 4 of 8 | 6.7 ng/L | 2.51 ng/L | none |
| Lithium | 0 of 8 | 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).
Health-based violations since 2016
None in EPA’s SDWIS data.
Source: EPA SDWIS via Envirofacts and the ECHO report for MD0150005, retrieved 16 Oct 2026.
Hardness
8.2 grains per gallon (highest plant or source figure of 2, 2024; 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 |
|---|---|---|
| Potomac Water Filtration Plant | – | 8.19 (3.63–11.6) |
| Patuxent Water Filtration Plant | – | 3.74 (2.98–11.6) |
From the same report. Which plant or source serves an address depends on where it is; the utility’s report explains its areas.
75 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
Silver Spring, Gaithersburg, Hyattsville, Rockville, Bethesda, Bowie, Germantown, Laurel, Upper Marlboro, Capitol Heights, College Park, Columbia, Greenbelt, Olney, Potomac, Riverdale, Takoma Park, Accokeek, Ashton, Beltsville, Bladensburg, Boyds, Brandywine, Brentwood, Brookeville, Burtonsville, Cabin John, Cheltenham, Chevy Chase, Clarksburg, Clinton, Crofton, Damascus, Derwood, District Heights, Fort Washington, Garrett Park, Glen Echo, Glenn Dale, Kensington, Lanham, Montgomery Village, Mount Rainier, Oxon Hill, Poolesville, Sandy Spring, Spencerville, Suitland, Temple Hills, Waldorf, Washington Grove.
20601 20607 20613 20623 20705 20706 20707 20708 20710 20712 20715 20716 20720 20721 20722 20723 20735 20737 20738 20740 20742 20743 20744 20745 20746 20747 20748 20769 20770 20771 20772 20773 20774 20781 20782 20783 20784 20785 20787 20790 20812 20814 20815 20816 20817 20818 20830 20832 20833 20837 20841 20850 20851 20852 20853 20854 20855 20857 20859 20860 20861 20866 20868 20871 20872 20874 20875 20876 20877 20878 20879 20880 20882 20884 20885 20886 20892 20895 20896 20898 20901 20902 20903 20904 20905 20906 20907 20910 20912 20913 20914 20915 20916 21045 21046 21114
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.