States › California › Plumas County

Plumas County, CA Water Quality

Water quality data for 21 public water systems serving Plumas County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 21 water systems · 27 cities
✅
Generally Safe — Most Systems Performing Well

The majority of water systems have no active violations and lead levels well below the federal action level.

B

Plumas County Earns a B

Plumas County: 27 communities across 21 water systems. 66.7% have no open violations.

  • Median lead where detected: 1.49 ppb
  • 10 communities with a lead detection, 17 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 66.7% of communities have no open violations
1.49 ppb
Median Lead Level
County-wide, 90th percentile
21
Water Systems
Active CWS & NTNCWS
66%
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 Davis
    Not detected
    No federal limits exceeded on record
    B
  • Greenville
    1.49 ppb
    No federal limits exceeded on record
    B
  • Graeagle
    Not detected
    No federal limits exceeded on record
    B
  • Hamilton Branch
    Not detected
    No federal limits exceeded on record
    B
  • Greenhorn
    Not detected
    No federal limits exceeded on record
    B
⚠ Needs Attention
County Lead Level — Median 1.49 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.49 ppb — 9.9% of the federal action level
Systems by Lead Level
Under 5 ppb
10
No Data
17

All Cities in Plumas County

Chester Not detected B
Portola 2.00 ppb B
Quincy 1.10 ppb A
Greenville 1.49 ppb B
Graeagle Not detected B
Delleker Not detected B
Hamilton Branch Not detected B
Lake Almanor Country Club Not detected C
East Quincy 1.10 ppb A
Plumas Eureka Not detected B
Greenhorn Not detected B
Lake Almanor West Not detected B
Lake Almanor Peninsula Not detected B
Beckwourth 1.00 ppb B
Whitehawk Not detected B
Taylorsville 1.49 ppb B
Crescent Mills 1.49 ppb B
Mabie Not detected C
Chilcoot-Vinton Not detected C
C-Road Not detected C
Gold Mountain Not detected C
Clio Not detected C
Twain 4.64 ppb C
Blairsden 4.00 ppb C
Lake Davis Not detected B
Valley Ranch Not detected C
Iron Horse 2.00 ppb B
Showing 27 cities
No active violations Active violations

About Plumas County Drinking Water

Plumas County is served by 21 water systems covering 27 communities. 67% have no open violations.

Of the communities reporting lead results, 10 recorded a detection, with a median of 1.49 ppb — 10% of the federal action level. 17 reported none detected, which means below the laboratory limit rather than an absence of lead.

No community here has PFAS above the federal limit on record. State inspectors recorded no significant deficiencies.

Frequently Asked Questions

Is Plumas County tap water safe to drink?▼
67% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Plumas County?▼
Among communities with a detection the median is 1.49 ppb, 10% of the 15 ppb action level. 17 reported none detected and 0 reported no result.
How many water systems serve Plumas County?▼
21 community water systems serve 27 communities here.
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