ZipCheckup grade for 20646: B.
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La Plata, MD (20646): 11 Violations Recorded for Mapped Water Systems - 81/100
EPA data combined for 9 water systems mapped to this ZIP (largest mapped system: Town of La Plata)
EPA records for the water systems mapped to 20646 in La Plata, MD contain 11 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 11 violations (non-health) (since 2021).
- Lead The reported 90th-percentile lead result is below the laboratory reporting limit, not a measured zero; EPA's health goal for lead is zero.
- PFAS PFAS detected in UCMR5 sampling; see the PFAS section for each compound, compared with the federal PFAS MCL where one exists.
- Radon EPA Zone 2 - county-level radon potential, not a home measurement.
- Flood 36 cumulative NFIP claim records. Check the current FEMA map for a specific address.
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In safety data on file for 20646 in La Plata, the high-priority tier holds 1 finding, with no critical-level conditions present.
Score Breakdown
Overall Home Safety Score: 81/100
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 (8) HIGH
Your Water System
ZIP code 20646 in La Plata, Maryland is mapped to the water system Town of La Plata (EPA ID: MD0080025). This system provides water to approximately 11,535 people from groundwater sources.
There are 9 community water systems serving this area.
Water Systems Serving This Area
| System Name | EPA ID | Population | Source |
|---|---|---|---|
| Town of La Plata | MD0080025 | 11,535 | Groundwater |
| Waldorf - Charles County Dpw | MD0080049 | 84,296 | Surface water |
| Ellenwood | MD0080057 | 229 | Groundwater |
| Bryans Road | MD0080033 | 6,260 | Groundwater |
| Mariellen Park | MD0080028 | 184 | Groundwater |
Other Water Quality Reports in Maryland
- 20588 (Dhs)
- 20601 (Waldorf) - 3 violations recorded for mapped water systems
- 20602 (Waldorf) - 3 violations recorded for mapped water systems
- 20603 (Waldorf) - 3 violations recorded for mapped water systems
- 20604 (Waldorf)
- 20606 (Abell)
- 20607 (Accokeek) - 3 violations recorded for mapped water systems
- 20608 (Aquasco)
- 20609 (Avenue)
- 20610 (Barstow)
- 20611 (Bel Alton) - 3 violations recorded for mapped water systems
- 20612 (Benedict)
- 20613 (Brandywine) - 2 violations recorded for mapped water systems
- 20615 (Broomes Island)
- 20616 (Bryans Road) - 1 violation recorded for mapped water systems
- 20617 (Bryantown)
- 20618 (Bushwood)
- 20619 (California) - 12 violations recorded for mapped water systems
- 20620 (Callaway) - 1 violation recorded for mapped water systems
- 20621 (Chaptico) - 4 violations recorded for mapped water systems
Nearby Water Quality Reports
- 20604 (Waldorf) - 1 mi
- 20677 (Port Tobacco) - 4 mi - 3 violations recorded for mapped water systems
- 20611 (Bel Alton) - 4 mi - 3 violations recorded for mapped water systems
- 20675 (Pomfret) - 4 mi - 3 violations recorded for mapped water systems
- 20695 (White Plains) - 5 mi - 3 violations recorded for mapped water systems
- 20632 (Faulkner) - 6 mi - 1 violation recorded for mapped water systems
- 20602 (Waldorf) - 6 mi - 3 violations recorded for mapped water systems
- 20693 (Welcome) - 7 mi
- 20603 (Waldorf) - 7 mi - 3 violations recorded for mapped water systems
- 20617 (Bryantown) - 8 mi
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Town of La Plata (MD0080025) 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 20646.
Detected compounds: PFPeA, PFHxA, PFBS.
Highest measured level: 0.006 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.
Health Risks from Detected Contaminants
Fluoride
Moderate RiskEPA reference value: 4 mg/L (estándar secundario: 2.0 mg/L)
Tooth & bone damage at high levels
At-risk groups: children aged 8 and younger during tooth development
Treatment options (verify a product is certified to reduce this contaminant): reverse osmosis, activated alumina, distillation · Find a filter →
Environmental Hazards (11) MODERATE
Home & Infrastructure (8) OK
Cost & Community (9) OK
CPSC product recall notices
These national notices are not matched to this ZIP code or water system.
Protect Your Home in La Plata
Based on local data for ZIP 20646, 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 La Plata has 36 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)
Service 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 20646 safe to drink?
EPA SDWIS records 11 violations since 2021 across the water systems mapped to ZIP 20646 (primary system: Town of La Plata), 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 20646's water come from?
The recorded water source for Town of La Plata, a system mapped to ZIP code 20646, is Groundwater. This system serves approximately 11,535 people.
How does La Plata water compare to the national average?
La Plata's Home Safety Score ranks better than 62% of U.S. ZIP codes, and at or above 72% within Maryland.
How can I get my water tested in La Plata?
If Town of La Plata 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.
What is the radon risk for 20646?
20646 is mapped to a county in EPA Radon Zone 2 (moderate county-level radon potential; EPA recommends testing every home), located in Charles 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 20646's water?
Yes, PFAS have been detected in samples from water systems mapped to 20646. 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 20646?
FEMA records contain 36 flood insurance claims filed in ZIP code 20646; 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). La Plata, MD (20646): 11 Violations Recorded for Mapped Water Systems - 81/100. https://zipcheckup.com/report/20646/
@misc{zipcheckup-report-20646,
author = {{ZipCheckup}},
title = {{La Plata, MD (20646): 11 Violations Recorded for Mapped Water Systems - 81/100}},
year = {2026},
url = {https://zipcheckup.com/report/20646/}
}
Page version: October 2026.
Nearby ZIP Code Reports
Water quality comparison for ZIP codes near 20646
| ZIP Code | City, State | Distance | Grade | Violations |
|---|---|---|---|---|
| 20604 | Waldorf, MD | 1.1 mi | N/A | 0 |
| 20677 | Port Tobacco, MD | 3.5 mi | N/A | 3 |
| 20611 | Bel Alton, MD | 3.7 mi | N/A | 3 |
| 20675 | Pomfret, MD | 4.3 mi | N/A | 3 |
| 20695 | White Plains, MD | 5.0 mi | B | 3 |
| 20632 | Faulkner, MD | 6.1 mi | N/A | 1 |
| 20602 | Waldorf, MD | 6.4 mi | B | 3 |
| 20693 | Welcome, MD | 7.1 mi | N/A | 0 |
| 20603 | Waldorf, MD | 7.2 mi | B | 3 |
| 20617 | Bryantown, MD | 7.7 mi | N/A | 0 |
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