CITY REPORT WA

Castle Rock, WA: 7 Violations - Home Safety 98/100

1 ZIP code · 3 water systems · Updated

ZipCheckup grade for Castle Rock: A.

No federal data flags a major home-safety concern for this ZIP.

Castle Rock, WA: reliable drinking water, above-average safety record, few violations.

How Castle Rock Compares

Castle Rock98/100
Washington avg86/100
National avg73/100

Data: EPA SDWIS

1
ZIP Codes
3
Water Systems
1
ZIPs with Violations
A · 98
Avg Safety Score
Zone 3
Radon Risk (Low)
$382K
Median Home Value
$1,800
Est. Remediation (0.5% of home value)

Castle Rock Water: The Quick Version

  • Your city's water systems recorded 7 violations in the past 5 years.
  • Average lead level: 0.005 mg/L.
  • Homes built before 1986: 53% - older plumbing may contain lead solder.
  • Estimated remediation: $1,800 per household.
  • CDC health risk index: 13.81 - above typical levels.

Water Systems Serving Castle Rock

Across Castle Rock, WA, residential water comes from 3 primary utilities rather than a single consolidated provider. Each system operates independently - managing its own distribution infrastructure, rate schedules, and EPA compliance filings. Federal records track 3 water systems in the area, with these top providers accounting for the majority of residential connections.

Overview

We track home safety data for 1 ZIP code in Castle Rock, Washington (population ~9,367), covering 3 community water systems serving approximately 73,953 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 Castle Rock: A (98/100)

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

Castle Rock water systems draw from: Groundwater, Surface water.

Lead & Copper

  • Average lead level (90th percentile): 0.0050 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 3 (Low Risk)

Top Contaminants

Contaminant Category Violations ZIPs Affected
Surface Water Treatment Rule Treatment Technique 6 1
Haloacetic Acids (HAA5) Disinfection Byproducts 4 1
Total Trihalomethanes (TTHM) Disinfection Byproducts 2 1
E. coli Microbiological 2 1

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
98611 A 7 0 Castle Rock Municipal Water

All ZIP Codes in Castle Rock

  • 98611 [A] - 7 violations

Data Sources

Reporting periods vary by source. Missing data is shown as unavailable, not as zero.

CDC Health Data for Castle Rock

12.3%
Asthma (US: 9.8%)
11.4%
Diabetes (US: 10.4%)
18.7%
Poor Mental Health (US: 14.8%)

Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.

Compared to National Average

Asthma 12.3% ↑
Diabetes 11.4% ↑
Mental Health 18.7% ↑

Vertical line = national average. ■ Above national · ■ Below national

Key Contaminants Detected in Castle Rock

Surface Water Treatment Rule 6 violations
Treatment Technique
Pathogens may not be adequately removed
Haloacetic Acids (HAA5) 4 violations
Disinfection Byproducts · EPA limit: 0.06 mg/L
Increased cancer risk with long-term exposure
Total Trihalomethanes (TTHM) 2 violations
Disinfection Byproducts · EPA limit: 0.08 mg/L
Increased cancer risk with long-term exposure

Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.

How Old Is Castle Rock's Housing Stock?

1987
Median Build Year
53%
Built Before 1986
23%
Built Before 1970
Copper
Likely Pipe Material

With 53% 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

Housing age is one of the most reliable proxies for plumbing-era lead risk, because two federal milestones - the widespread use of lead pipes before 1970 and the continued use of lead solder until 1986 - define the highest-risk tiers of the residential housing stock. With a median build year of 1987, Castle Rock falls squarely within the older range - meaning a large fraction of the housing was built under the plumbing standards of those earlier eras. The distribution above captures where that risk concentrates, and why older neighborhoods warrant particular attention from residents concerned about tap water quality.

1987
Median Year Built
53%
Pre-1986 (Lead Paint Risk)
23%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (23%) 1970–1986 (30%) Post-1986 (47%)

Over half of homes in Castle Rock 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.

Castle Rock: Remediation Cost in Perspective

In Castle Rock, property wealth outpaces what documented remediation typically demands - the equity burden lands well within the low tier.

Median Home Value
$382,000
Est. Remediation
$1,800
Remediation as % of home value 0.5%

Remediation costs in Castle Rock are relatively low compared to home values. The $1,200–$2,500 estimated range is a small fraction of median property value. Home values are 18% below the Washington average.

Protecting Children from Lead in Castle Rock

53%
Homes Built Before 1986
0.005
mg/L Avg Lead (Limit: 0.015)

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.

In recent monitoring under the Lead and Copper Rule, citywide samples for Castle Rock have approached or crossed the regulatory action level on multiple occasions. Combined with 53% of stock dating from the pre-rule era, the picture supports baseline single-tap reads as a standard household-level step.

Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.

Historical Flood-Claim Evidence for Castle Rock

170
Total FEMA Flood Claims
$30,565
Avg Reported Sum With Payment Data
0%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Castle Rock contains 170 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $30,565. 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>$1,800</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.

Deep Dive Reports

Detailed analysis for Castle Rock, WA

Frequently Asked Questions

What does the Home Safety Score mean for Castle Rock, WA?
Castle Rock has an average Home Safety Score of 98/100 (Grade A) under model 4.0.0. The score combines EPA SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the PFAS MCL screen, EPA radon zone, and annual EPA AQI, and is published only when all required domains are observed. 7 EPA violations have been recorded. Check individual ZIP code reports for component details.
How many water violations does Castle Rock have?
Castle Rock water systems have a total of 7 EPA violations. Violations are tracked across 1 ZIP code.
Does Castle Rock water have lead?
The average 90th-percentile lead level in Castle Rock is 0.005 mg/L. This is below the EPA action level of 0.015 mg/L. Lead levels can vary by home - testing is recommended especially in older properties.
How does Castle Rock compare to Washington average?
Castle Rock has an average Home Safety Score of 98/100, which is above the Washington state average of 86/100 for the same model series.
How many water systems serve Castle Rock?
Castle Rock is served by 3 public water systems across 1 ZIP code, serving approximately 9,367 people.
How much does it cost to fix water issues in Castle Rock?
Estimated remediation costs in Castle Rock average $1,800 per household, ranging from $1,200 to $2,500. Costs include filtration, pipe replacement, radon mitigation, and flood protection.
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How to cite this page

APA ZipCheckup. (2026). Castle Rock, WA: 7 Violations - Home Safety 98/100. https://zipcheckup.com/cities/wa/castle-rock/
BibTeX 
@misc{zipcheckup-cities-wa-castle-rock,
  author = {{ZipCheckup}},
  title  = {{Castle Rock, WA: 7 Violations - Home Safety 98/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/wa/castle-rock/}
}

Page version: August 2026.

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