States › California › Tehama County

Tehama County, CA Water Quality

Water quality data for 9 public water systems serving Tehama County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 9 water systems · 10 cities
✅
Excellent — All Systems Performing Well

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

A

Tehama County Earns a A

Tehama County: 10 communities across 9 water systems. 90.0% have no open violations.

  • Median lead where detected: 1.08 ppb
  • 3 communities with a lead detection, 7 reporting none detected
  • 0 communities with PFAS above the federal limit
  • 0 with significant inspection deficiencies
  • 90.0% of communities have no open violations
1.08 ppb
Median Lead Level
County-wide, 90th percentile
9
Water Systems
Active CWS & NTNCWS
90%
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
  • Las Flores
    Not detected
    No federal limits exceeded on record
    B
  • Red Bluff
    Not detected
    No federal limits exceeded on record
    A
  • Gerber
    Not detected
    No federal limits exceeded on record
    B
  • Tehama
    Not detected
    No federal limits exceeded on record
    B
  • Corning
    1.08 ppb
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Mineral
    4.21 ppb
    1 violation currently open
    C
  • Los Molinos
    Not detected
    16 health-based violations since 2015
    B
  • Paskenta
    0.92 ppb
    22 health-based violations since 2015
    B
  • Lake California
    Not detected
    1 health-based violation since 2015
    B
  • Las Flores
    Not detected
    No federal limits exceeded on record
    B
County Lead Level — Median 1.08 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.08 ppb — 7.2% of the federal action level
Systems by Lead Level
Under 5 ppb
3
No Data
7

All Cities in Tehama County

Red Bluff Not detected A
Lake California Not detected B
Los Molinos Not detected B
Gerber Not detected B
Tehama Not detected B
Corning 1.08 ppb A
Paskenta 0.92 ppb B
Mineral 4.21 ppb C
Vina Not detected B
Las Flores Not detected B
Showing 10 cities
No active violations Active violations

About Tehama County Drinking Water

Tehama County is served by 9 water systems covering 10 communities. 90% have no open violations.

Of the communities reporting lead results, 3 recorded a detection, with a median of 1.08 ppb — 7% of the federal action level. 7 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 Tehama County tap water safe to drink?▼
90% of communities have no open violation. No community has PFAS above the federal limit on record.
What is the lead level in Tehama County?▼
Among communities with a detection the median is 1.08 ppb, 7% of the 15 ppb action level. 7 reported none detected and 0 reported no result.
How many water systems serve Tehama County?▼
9 community water systems serve 10 communities here.
← Back to California water quality overview