CITY REPORT OR HEALTH VIOLATIONS: 1

Lake Oswego, OR: PFAS Found in Water - Home Safety 96/100

2 ZIP codes · 7 water systems · Updated

ZipCheckup grade for Lake Oswego: A.

Checked records flag no major concern; missing data is unknown.

Within Lake Oswego, OR, the available records add up to an upper-tier grade; that grade describes records, not the water at a given faucet.

How Lake Oswego Compares

Lake Oswego96/100
Oregon avg85/100
National avg73/100

Data: EPA SDWIS

2
ZIP Codes
7
Water Systems
2
ZIPs Linked to Systems with Violations
A · 96
Avg Safety Score
Zone 3
County Radon Potential (Low)
$996K
Median Home Value
$300
Est. Remediation (0.0% of home value)

Lake Oswego Water: The Quick Version

  • Your city's water systems recorded 49 violations since 2021.
  • Average of reported 90th-percentile lead results: 0.005 mg/L.
  • Homes built before 1986: 63% - older plumbing may contain lead solder.
  • Estimated remediation: $300 per household.
  • Health risk index (ZipCheckup composite of CDC data): 12.12.

Water Systems Serving Lake Oswego

The 3 largest of 7 systems connected with Lake Oswego, OR are listed below.

Overview

We track home safety data for 2 ZIP codes in Lake Oswego, Oregon (population ~46,994), covering 7 community water systems serving approximately 742,300 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 2 ZIP codes.

2 of 2 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. 1 health-based violation appear in the available health breakdown.

Home Safety Score

Average Home Safety Score for Lake Oswego: A (96/100)

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

Lake Oswego water systems draw from: Groundwater, Surface water.

Lead & Copper

  • Average of reported 90th-percentile lead results: 0.0050 mg/L (EPA action level: 0.015 mg/L)
  • 0 of 2 ZIP codes with known status exceed the EPA lead action level

Radon Risk

2 of 2 ZIP records with known zones are in EPA Radon Zone 3.

The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.

Top Contaminants

Contaminant Category Violations ZIPs Affected
Consumer Confidence Rule Reporting 23 2
Revised Total Coliform Rule Microbiological 5 2
Xylenes, Total Organic 4 2
Lead and Copper Rule Treatment Technique 4 2
Glyphosate Organic 3 2

Areas with Most Violations

ZIP Code Safety Score Violations Health-Based System
97035 A 41 1 Lake Oswego Municipal Water
97034 A 37 0 Lake Oswego Municipal Water

All ZIP Codes in Lake Oswego

  • 97034 [A] - 37 violations
  • 97035 [A] - 41 violations ⚠

Data Sources

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

CDC Health Data for Lake Oswego

11.6%
Asthma (US: 9.8%)
10.5%
Diabetes (US: 10.4%)
16.5%
Poor Mental Health (US: 14.8%)

Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.

Compared to National Average

Asthma 11.6% ↑
Diabetes 10.5% ↑
Mental Health 16.5% ↑

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

Key Contaminants Detected in Lake Oswego

Consumer Confidence Rule 23 violations
Reporting
Revised Total Coliform Rule 5 violations
Microbiological
Indicates possible bacterial contamination
Xylenes, Total 4 violations
Organic

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

How Old Is Lake Oswego's Housing Stock?

1981
Median Build Year
63%
Built Before 1986
29%
Built Before 1970
Copper
Likely Pipe Material

With 63% of homes built before 1986, lead solder in plumbing is a potential concern. Federal law banned lead solder in drinking-water plumbing in 1986, but many older homes retain original plumbing.

Source: U.S. Census Bureau American Community Survey (ACS).

Housing Age Profile

Pre-1986 homes make up a large part of Lake Oswego's housing; median build year 1981.

1981
Median Year Built
63%
Pre-1986 (lead solder era; lead paint banned 1978)
29%
Pre-1970 (Lead Pipes Risk)
Pre-1970 (29%) 1970–1986 (34%) Post-1986 (37%)

Over half of homes in Lake Oswego were built before 1986, when federal law began restricting lead solder in drinking-water plumbing. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.

Source: U.S. Census Bureau ACS B25034.

Lake Oswego: Remediation Cost in Perspective

The remediation-to-value ratio for Lake Oswego sits at the bottom of the scale.

Median Home Value
$995,900
Est. Remediation
$300
Remediation as % of home value 0.0%

Estimated remediation costs in Lake Oswego can be compared with local home values. The $150–$600 estimated range can be set against the median property value; actual costs vary by home. Home values are 146% above the Oregon average.

Protecting Children from Lead in Lake Oswego

63%
Homes Built Before 1986
0.005
mg/L average of reported water-system 90th-percentile lead results (the 0.015 action level applies to each system's result, not to this average)

Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.

If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.

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

Historical Flood-Claim Evidence for Lake Oswego

121
Total FEMA Flood Claims
$51,708
Avg Reported Sum With Payment Data
100%
A/V Share of Claim-Record ZIPs

Historical NFIP data for Lake Oswego contains 121 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $51,708. Among ZIP codes with claim records, 100% 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 $300 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 Lake Oswego, OR

Frequently Asked Questions

What does the Home Safety Score mean for Lake Oswego, OR?
Lake Oswego has an average Home Safety Score of 96/100 (Grade A) under ZipCheckup model 4.0.0, an area-level model that draws on EPA water compliance records, PFAS screening, EPA radon zones, and annual EPA air quality data; see the methodology page for how inputs and coverage are handled. 49 violations appear in EPA records for water systems mapped to these ZIP codes. Check individual ZIP code reports for component details.
How many violations are on record for water systems serving Lake Oswego?
EPA records list 49 EPA violations, including 1 health-based violation for Lake Oswego water systems. These water-system violations are shown for 2 mapped ZIP codes.
Does Lake Oswego water have lead?
The average of the reported 90th-percentile lead results across the ZIP codes of Lake Oswego is 0.005 mg/L. The EPA action level of 0.015 mg/L applies to each water system's own 90th percentile, not to this average. EPA's health goal for lead is zero. Lead levels can vary by home - testing is recommended especially in older properties.
How does Lake Oswego compare to Oregon average?
Lake Oswego has an average Home Safety Score of 96/100, which is at or above the Oregon state average of 85/100 for the same model series.
How many water systems serve Lake Oswego?
Our records map 7 water systems to 2 ZIP codes in Lake Oswego. The related population figure in our data is approximately 46,994 people; it is not a count of people served citywide.
How much does it cost to fix water issues in Lake Oswego?
Estimated remediation cost per household in Lake Oswego: $300; modeled range $150 to $600. Estimated costs may include filtration, pipe replacement, radon mitigation, or flood protection where applicable.
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How to cite this page

APA ZipCheckup. (2026). Lake Oswego, OR: PFAS Found in Water - Home Safety 96/100. https://zipcheckup.com/cities/or/lake-oswego/
BibTeX 
@misc{zipcheckup-cities-or-lake-oswego,
  author = {{ZipCheckup}},
  title  = {{Lake Oswego, OR: PFAS Found in Water - Home Safety 96/100}},
  year   = {2026},
  url    = {https://zipcheckup.com/cities/or/lake-oswego/}
}

Page version: October 2026.

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