Derwood, MD: 16 Violations - Home Safety 61/100
1 ZIP code · 2 water systems · Updated
ZipCheckup grade for Derwood: C.
A mixed picture - some signals here are worth your attention.
Derwood, MD: middle-tier water safety by the latest federal monitoring.
How Derwood Compares
Data: EPA SDWIS
What You Should Know About Derwood Water
- Your city's water systems recorded 16 violations in the past 5 years.
- Homes built before 1986: 61% - older plumbing may contain lead solder.
- Estimated remediation: $2,900 per household.
- CDC health risk index: 10.24.
Who Supplies Your Water in Derwood
Water delivery in Derwood, MD is handled by 2 utilities rather than a single system - drawn from 2 providers in federal records, each filing its own compliance reports and setting its own rates.
- C
- C
Overview
We track home safety data for 1 ZIP code in Derwood, Maryland (population ~16,557), covering 2 community water systems serving approximately 1,952,000 people region-wide. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.
1 of 1 ZIP code with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for Derwood: C (61/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Derwood water systems draw from: Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0000 mg/L (EPA action level: 0.015 mg/L)
- 0 of 1 ZIP code with known status exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Contaminant 2005 | Other | 2 | 1 |
| Contaminant 2010 | Other | 2 | 1 |
| Contaminant 2015 | Other | 2 | 1 |
| Contaminant 2020 | Other | 2 | 1 |
| Contaminant 2035 | Other | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 20855 | C | 16 | 0 | Washington Suburban Sanitary Commission |
All ZIP Codes in Derwood
- 20855 [C] - 16 violations
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in Derwood
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Derwood Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Derwood
With 61% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Heavily weighted toward older construction, Derwood's housing stock carries a median build year of 1987. That profile puts a majority of homes in the era when lead-soldered copper plumbing was standard practice.
Over half of homes in Derwood were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Derwood Homeowners
Equity impact data for Derwood lands in the favorable tier - remediation claims a small slice of what properties here are worth.
Remediation costs in Derwood are relatively low compared to home values. The $1,900–$4,100 estimated range is a small fraction of median property value. Home values are 44% above the Maryland average.
Lead Exposure Risk for Children in Derwood
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Routinely in Derwood, where 61% of housing predates the solder ban and aggregate utility readings hover near the federal threshold, a faucet-level draw functions as a standard household step for families with small kids.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Derwood
Historical NFIP data for Derwood contains 10 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $2,950. Among ZIP codes with claim records, 0% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. The <strong>$2,900</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
What You Can Do in Derwood
- Test your water at home. City-level data shows averages - your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. Filters rated for Contaminant 2005 can reduce the most common contaminant found in Derwood's water.
- Check your home's plumbing. With 61% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Derwood, MD