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San Bernardino County, CA Water Quality

Water quality data for 45 public water systems serving San Bernardino County, California — based on EPA SDWIS enforcement records, lead testing results, and health-based violation history.

📅 2026 Report 🔄 Data updated 2026 Q2 📍 45 water systems · 51 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

San Bernardino County Earns a B

San Bernardino County: 51 communities across 45 water systems. 94.1% have no open violations.

  • Median lead where detected: 1.60 ppb
  • 14 communities with a lead detection, 37 reporting none detected
  • 12 communities with PFAS above the federal limit
  • 9 with significant inspection deficiencies
  • 94.1% of communities have no open violations
1.6 ppb
Median Lead Level
County-wide, 90th percentile
45
Water Systems
Active CWS & NTNCWS
94%
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
  • San Bernardino
    Not detected
    No federal limits exceeded on record
    A
  • Rancho Cucamonga
    Not detected
    No federal limits exceeded on record
    A
  • Victorville
    Not detected
    No federal limits exceeded on record
    A
  • Chino
    1.00 ppb
    No federal limits exceeded on record
    A
  • Chino Hills
    Not detected
    No federal limits exceeded on record
    A
⚠ Needs Attention
  • Big River
    2.70 ppb
    Copper above the 1,300 ppb action level
    F
  • Yucaipa
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Oak Glen
    Not detected
    Copper above the 1,300 ppb action level
    D
  • Highland
    Not detected
    PFAS above the limit at 1 of 13 sampling points
    D
  • Colton
    Not detected
    PFAS above the limit at 2 of 7 sampling points
    D
County Lead Level — Median 1.6 ppb
Based on most recent 90th percentile lead tests across all reporting systems
0 ppb5 ppb10 ppb15 ppb
County median: 1.6 ppb — 10.7% of the federal action level
Systems by Lead Level
Under 5 ppb
13
10 – 15 ppb
1
No Data
37

All Cities in San Bernardino County

San Bernardino Not detected A
Fontana Not detected A
Rancho Cucamonga Not detected A
Ontario 0.60 ppb C
Victorville Not detected A
Hesperia Not detected B
Chino 1.00 ppb A
Chino Hills Not detected A
Upland Not detected A
Redlands 2.90 ppb B
Apple Valley 0.56 ppb A
Rialto Not detected A
Highland Not detected D
Colton Not detected D
Yucaipa Not detected D
Montclair Not detected B
Barstow 1.60 ppb A
Loma Linda Not detected A
Yucca Valley 1.70 ppb A
Bloomington Not detected A
Twentynine Palms Not detected A
Grand Terrace 1.50 ppb C
Phelan Not detected A
Big Bear City Not detected C
Adelanto Not detected C
Spring Valley Lake Not detected A
Mentone 2.90 ppb B
Oak Hills Not detected A
Fort Irwin Not detected B
Muscoy Not detected A
Lake Arrowhead Not detected C
Piñon Hills Not detected A
Joshua Tree 11.00 ppb A
Silver Lakes Not detected D
Crestline Not detected B
Big Bear Lake Not detected A
Needles 3.40 ppb A
Lenwood 1.60 ppb A
Mountain View Acres Not detected A
San Antonio Heights Not detected A
Running Springs Not detected B
Homestead Valley Not detected B
Morongo Valley Not detected B
Lucerne Valley 1.30 ppb B
Yermo Not detected B
Big River 2.70 ppb F
Baker Not detected B
Searles Valley Not detected B
Oak Glen Not detected D
Lytle Creek Not detected B
Bluewater 1.00 ppb B
Showing 51 cities
No active violations Active violations

About San Bernardino County Drinking Water

San Bernardino County is served by 45 water systems covering 51 communities. 94% have no open violations.

Of the communities reporting lead results, 14 recorded a detection, with a median of 1.60 ppb — 11% of the federal action level. 37 reported none detected, which means below the laboratory limit rather than an absence of lead.

12 of 51 communities have PFAS above the limits EPA set in 2024, measured as a running annual average at each sampling point. State inspectors recorded significant deficiencies at 9 of them.

Frequently Asked Questions

Is San Bernardino County tap water safe to drink?▼
94% of communities have no open violation. 12 of 51 have PFAS above the federal limit, which is the main open concern.
What is the lead level in San Bernardino County?▼
Among communities with a detection the median is 1.60 ppb, 11% of the 15 ppb action level. 37 reported none detected and 0 reported no result.
How many water systems serve San Bernardino County?▼
45 community water systems serve 51 communities here.
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