ZipCheckup grade for 20164: C.
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Sterling, VA (20164): PFAS Detected in Mapped Water Systems - 66/100
EPA data combined for 2 water systems mapped to this ZIP (largest mapped system: Loudoun Water - Central System)
EPA records for the water systems mapped to 20164 in Sterling, VA contain 1 recorded violations for inclusive record years 2021 through 2026, all mapped systems combined; 0 are marked health-based.
Data source: U.S. Environmental Protection Agency (EPA) SDWIS
At a Glance
- Water EPA records for water systems mapped to this ZIP show 1 violation (non-health) (since 2021).
- Lead The reported 90th-percentile lead result of 0.0005 mg/L is below the EPA action level for water systems; EPA's health goal for lead is zero.
- PFAS At least one PFAS result is above an EPA MCL value (UCMR5 sampling; MCL compliance required from 2029).
- Radon EPA Zone 2 - county-level radon potential, not a home measurement.
- Flood 18 cumulative NFIP claim records. Claim evidence is historical, not current map coverage.
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For Sterling (20164), only one finding reaches the critical designation.
Score Breakdown
Overall Home Safety Score: 66/100
This is the published model score. Component and domain values are shown independently; they are not added together on this page.
Canonical components
Required domains
Coverage: 4 of 4 components and 3 of 3 domains observed.
Model 4.0.0; series home-safety-v4-cross-vertical.
Safety & Health (7) HIGH
Your Water System
ZIP code 20164 in Sterling, Virginia is mapped to the water system Loudoun Water - Central System (EPA ID: VA6107350). This system provides water to approximately 334,808 people from surface water sources.
There are 2 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Loudoun Water - Central System | VA6107350 | 334,808 | Surface water |
| Fairfax County Water Authority | VA6059501 | 1,121,613 | Surface water |
Other Water Quality Reports in Virginia
- 20101 (Dulles)
- 20102 (Dulles)
- 20103 (Dulles)
- 20104 (Dulles)
- 20105 (Aldie) - 5 violations recorded for mapped water systems
- 20106 (Amissville)
- 20108 (Manassas)
- 20109 (Manassas)
- 20110 (Manassas)
- 20111 (Manassas)
- 20112 (Manassas)
- 20113 (Manassas)
- 20115 (Marshall)
- 20116 (Marshall)
- 20117 (Middleburg) - 4 violations recorded for mapped water systems
- 20118 (Middleburg)
- 20119 (Catlett) - 1 violation recorded for mapped water systems
- 20120 (Centreville) - 1 violation recorded for mapped water systems
- 20121 (Centreville)
- 20122 (Centreville)
Nearby Water Quality Reports
- 20165 (Sterling) - 2 mi - 1 violation recorded for mapped water systems
- 20163 (Sterling) - 2 mi
- 20167 (Sterling) - 2 mi
- 20189 (Dulles) - 2 mi
- 20101 (Dulles) - 3 mi
- 20170 (Herndon) - 3 mi
- 20103 (Dulles) - 3 mi
- 20598 (Dhs) - 3 mi
- 20172 (Herndon) - 4 mi
- 22095 (Herndon) - 4 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Loudoun Water - Central System (VA6107350) on EPA.gov.
4 of the top compounds applied across the surrounding county in USGS pesticide-use estimates appear on EPA drinking-water monitoring lists. See the agricultural pesticide-use section.
PFAS Contamination Detected
PFAS ("forever chemicals") have been reported in samples from water systems associated with ZIP code 20164. One or more compound results are above the level of a federal PFAS MCL with compliance required from 2029.
Detected compounds: PFPeA, PFBA, PFHxA, 6:2 FTS, PFBS, PFOA, PFOS, PFHpA.
Highest measured level: 0.0215 µg/L
Reverse osmosis (RO) and activated carbon block filters can reduce PFAS at the tap. Certifications list the compounds covered: an NSF/ANSI 53 or 58 claim for PFOA/PFOS does not cover every PFAS, so check that the product lists the compounds detected here.
Environmental Hazards (11) CRITICAL
Home & Infrastructure (7) MODERATE
Cost & Community (9) HIGH
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in Sterling
Based on local data for ZIP 20164, these services may benefit homeowners in your area.
Based on local data for your area. Use the tools below to explore your options.
Home & Flood Insurance
The ZIP code for this report in Sterling has 18 FEMA flood claims on record. Standard homeowner policies don't cover flood damage - make sure you're protected.
Typical cost: Flood insurance: premiums vary by property and flood zone; request a quote
Check Your Flood Zone (Free)FEMA flood map lookup - see if your property is in a flood zone
Free tip: Check your FEMA flood zone at msc.fema.gov (free lookup)
Gutter Installation & Repair
The median home in 20164 was built around 1988. Aging gutters can cause foundation damage, basement flooding, and mold - a professional assessment can prevent costly repairs.
Typical cost: Gutter installation: typically $1,000–$2,500 for a standard home
Estimate Your Home Maintenance CostsService recommendations are based on public data for this ZIP code (FEMA, Census ACS, NWS). Actual needs vary by property. By calling, your information will be shared with an independent service provider. ZipCheckup may receive compensation. Cost estimates are approximate and vary by property, condition, and contractor.
Frequently Asked Questions
Is the tap water in 20164 safe to drink?
EPA SDWIS records 1 violation since 2021 across the water systems mapped to ZIP 20164 (primary system: Loudoun Water - Central System), including 0 health-based. The violation table above shows which system each record belongs to. ZipCheckup last updated this page in July 2026. The federal source release date is unavailable, so that month is not presented as source currency.
Where does 20164's water come from?
The recorded water source for Loudoun Water - Central System, a system mapped to ZIP code 20164, is Surface water. This system serves approximately 334,808 people.
How does Sterling water compare to the national average?
Sterling's Home Safety Score ranks lower than 71% of U.S. ZIP codes, and lower than 68% of ZIP codes within Virginia.
How can I get my water tested in Sterling?
If Loudoun Water - Central System supplies your home, contact it for its Consumer Confidence Report; otherwise contact the water utility that serves your address, or hire a certified lab for independent home water testing. The EPA recommends annual testing if you use a private well.
Is lead a concern in 20164 tap water?
The Lead and Copper Rule record selected for 20164 reports a 90th-percentile lead result of 0.0005 mg/L for a water system mapped to this ZIP (record date 2026-12-31). The EPA action level is 0.015 mg/L. This result is below the EPA action level; it does not show the lead level in each home.
What is the radon risk for 20164?
20164 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Loudoun County. EPA radon zones range from Zone 1 (highest county-level potential) to Zone 3 (lowest). Testing your home is recommended regardless of zone.
Are there PFAS (forever chemicals) in 20164's water?
Yes, PFAS have been detected in samples from water systems mapped to 20164. One or more PFAS results are above the level of a federal PFAS MCL with compliance required from 2029. Reverse osmosis and activated carbon filters certified to NSF/ANSI 53 or 58 specifically for PFOA/PFOS reduction can reduce PFAS.
What does the NFIP claim history show for ZIP 20164?
FEMA records contain 18 flood insurance claims filed in ZIP code 20164; the recorded rated-zone value (the most frequent one if there are several claims) is X, which is claims evidence and may differ from the current FEMA map zone for a property. Claim records do not establish current property risk. Review FEMA's map for the specific property.
How to cite this page
ZipCheckup. (2026). Sterling, VA (20164): PFAS Detected in Mapped Water Systems - 66/100. https://zipcheckup.com/report/20164/
@misc{zipcheckup-report-20164,
author = {{ZipCheckup}},
title = {{Sterling, VA (20164): PFAS Detected in Mapped Water Systems - 66/100}},
year = {2026},
url = {https://zipcheckup.com/report/20164/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 20164
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 20165 | Sterling, VA | 1.8 mi | B | 1 |
| 20163 | Sterling, VA | 2.0 mi | N/A | 0 |
| 20167 | Sterling, VA | 2.0 mi | N/A | 0 |
| 20189 | Dulles, VA | 2.5 mi | N/A | 0 |
| 20101 | Dulles, VA | 2.7 mi | N/A | 0 |
| 20170 | Herndon, VA | 3.2 mi | D | 0 |
| 20103 | Dulles, VA | 3.3 mi | N/A | 0 |
| 20598 | Dhs, VA | 3.4 mi | N/A | 0 |
| 20172 | Herndon, VA | 3.8 mi | N/A | 0 |
| 22095 | Herndon, VA | 3.8 mi | N/A | 0 |
Nearby ZIP Code Reports
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