States › Oregon › Clackamas County

Clackamas County, OR Water Quality

Water quality data for 19 public water systems serving Clackamas County, Oregon — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 19 water systems · 25 cities
✅
Excellent — All Systems Performing Well

Water quality across the county is outstanding with minimal violations and very low lead levels.

A

Clackamas County Earns a A

Clackamas County: 25 communities across 19 water systems. 96.0% have no open violations.

  • Median lead where detected: 2.10 ppb
  • 23 communities with a lead detection, 2 reporting none detected
  • 3 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 96.0% of communities have no open violations
2.1 ppb
Median Lead Level
County-wide, 90th percentile
19
Water Systems
Active CWS & NTNCWS
96%
Violation-Free
No active violations on record
How we grade counties: MyWaterIQ uses EPA SDWIS enforcement data — actual MCL violations and lead test results — not the aspirational MCLG targets used by some sites. A grade reflects real compliance history, not theoretical risk. Learn more →

Cities by Water Quality

⭐ Best Performing
  • Lake Oswego
    Not detected
    No federal limits exceeded on record
    A
  • Oregon City
    1.84 ppb
    No federal limits exceeded on record
    A
  • West Linn
    1.84 ppb
    No federal limits exceeded on record
    A
  • Oatfield
    1.73 ppb
    No federal limits exceeded on record
    A
  • Molalla
    1.26 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Sandy
    13.00 ppb
    1 violation currently open
    D
  • Happy Valley
    3.00 ppb
    PFAS above the limit at 1 of 4 sampling points
    B
  • Milwaukie
    Not detected
    PFAS above the limit at 2 of 3 sampling points
    B
  • Damascus
    3.00 ppb
    PFAS above the limit at 1 of 4 sampling points
    B
  • Mount Hood Villages
    5.70 ppb
    Copper above the 1,300 ppb action level
    B
County Lead Level — Median 2.1 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 2.1 ppb — 14% of the federal action level
Systems by Lead Level
Under 5 ppb
19
5 – 10 ppb
3
10 – 15 ppb
1
No Data
2

All Cities in Clackamas County

Lake Oswego Not detected A
Oregon City 1.84 ppb A
West Linn 1.84 ppb A
Wilsonville 7.60 ppb A
Happy Valley 3.00 ppb B
Milwaukie Not detected B
Canby 2.10 ppb A
Oak Grove 2.67 ppb A
Sandy 13.00 ppb D
Gladstone 3.30 ppb B
Oatfield 1.73 ppb A
Molalla 1.26 ppb A
Damascus 3.00 ppb B
Jennings Lodge 2.67 ppb A
Estacada 2.10 ppb A
Beavercreek 1.73 ppb A
Boring 1.23 ppb B
Mount Hood Villages 5.70 ppb B
Mulino 5.00 ppb B
Johnson City 1.73 ppb A
Rivergrove 2.71 ppb B
Stafford 1.84 ppb A
Rhododendron 4.13 ppb B
Government Camp 1.00 ppb B
Barlow 2.10 ppb A
Showing 25 cities
No active violations Active violations

About Clackamas County Drinking Water

Clackamas County is served by 19 water systems covering 25 communities. 96% have no open violations.

Of the communities reporting lead results, 23 recorded a detection, with a median of 2.10 ppb — 14% of the federal action level. 2 reported none detected, which means below the laboratory limit rather than an absence of lead.

3 of 25 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Clackamas County tap water safe to drink?▼
96% of communities have no open violation. 3 of 25 have PFAS above the federal limit, which is the main open concern.
What is the lead level in Clackamas County?▼
Among communities with a detection the median is 2.10 ppb, 14% of the 15 ppb action level. 2 reported none detected and 0 reported no result.
How many water systems serve Clackamas County?▼
19 community water systems serve 25 communities here.
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