RIVERSIDE HIGHLAND WATER COMPANY Water Quality Report
Serving roughly 20,188 people in San Bernardino County, California.
Data current as of July 2026
🔍Straight from EPA
🧪Real Lab Results
📅Updated Quarterly
🏠Local Expertise
Results for RIVERSIDE HIGHLAND WATER COMPANY
1 water provider directly on file, serving roughly 20,188 people in San Bernardino County, California.
Quick answer: RIVERSIDE HIGHLAND WATER COMPANY has no violations on file. One reading is worth knowing about: PFBA was measured at 0.01µg/L, among the highest of the 669 providers on file in this area. It's the most notable figure in this system's record among its 669 local peers.
Lead Summary
PFHXA
PFHXS
PFBS
Pfpes
Lithium
PFHPA
PFBA
PFPEA
PFOA
PFOS
Lead
TTHM
Chloroform
Bromoform
Bromodichloromethane
Dibromochloromethane
Copper, Free
Magnesium
Potassium
Sodium
Calcium
Alkalinity, Total
Alkalinity, Bicarbonate
Hardness, Total (ASCACO3)
TDS
Chloride
Sulfate
Fluoride
Nitrate
Perfluorobutanesulfonicacid (PFBS)
Perfluoroheptanoicacid (PFHPA)
Perfluorohexanesulfonicacid (PFHxS)
Perfluorohexanoicacid (PFHXA)
Perfluorobutanoicacid (PFBA)
Perfluoropentanoicacid (PFPEA)
Perfluoropentanesulfonicacid (PFPES)
Perfluoroctanesulfonicacid (PFOS)
Perfluoroctanoicacid (PFOA)
Turbidity
Combined Uranium
Gross Alpha Particle Activity
pH
Chromium
Barium
Arsenic
Conductivity (at 25°C)
Utility RIVERSIDE HIGHLAND WATER COMPANYPopulation served 20,188Owner Private
No violations on file
Contaminants found
Metals
Naturally occurring or corrosion-related elements, e.g. lead, arsenic, copper
Lead Summary
Detected: 0.0015 mg/L (ppm)
12/31/2025
Lead
Detected: 1.3 UG/L (ppb)
7/10/2025
A metal that can leach from old pipes, solder, and fixtures. Current medical guidance holds there is no truly safe level of lead exposure, especially for children and pregnant women.
Copper, Free
Detected: 150 UG/L (ppb)
7/10/2025
Combined Uranium
Detected: 2.33 PCI/L
1/15/2025
A naturally occurring radioactive metal. Long-term exposure above the legal limit is associated with kidney effects and increased cancer risk.
Chromium
Detected: 1.8 UG/L (ppb)
10/13/2025
Occurs in two forms — trivalent (an essential nutrient in trace amounts) and hexavalent (linked to increased cancer risk).
Barium
Detected: 40 UG/L (ppb)
10/13/2025
Arsenic
Detected: 2.3 UG/L (ppb)
10/13/2025
Occurs naturally in some groundwater. Long-term exposure above the legal limit (10 ppb) has been linked to increased cancer risk and cardiovascular disease.
Disinfection Byproducts
Formed when chlorine used to disinfect water reacts with organic matter
TTHM
Detected: 9.2 UG/L (ppb)
7/7/2025
A group of disinfection byproducts formed when chlorine reacts with organic matter. Long-term exposure above the legal limit has been linked to increased cancer risk in some studies.
Chloroform
Detected: 2.1 UG/L (ppb)
7/7/2025
One of the individual trihalomethane disinfection byproducts, formed when chlorine reacts with organic matter.
Bromoform
Detected: 0.98 UG/L (ppb)
7/7/2025
Bromodichloromethane
Detected: 3.2 UG/L (ppb)
7/7/2025
Dibromochloromethane
Detected: 2.9 UG/L (ppb)
7/7/2025
Inorganics
Common dissolved minerals and salts, e.g. nitrate, fluoride, chloride
Chloride
Detected: 16 MG/L (ppm)
10/13/2025
Sulfate
Detected: 32 MG/L (ppm)
10/13/2025
Fluoride
Detected: 0.17 MG/L (ppm)
10/13/2025
Often added deliberately for dental health; can also occur naturally.
Nitrate
Detected: 2.9 MG/L (ppm)
10/13/2025
Commonly from agricultural fertilizer runoff or septic systems. Above the legal limit, it's an immediate concern especially for infants.
Minerals
Everyday minerals that mainly affect taste and water hardness
Magnesium
Detected: 10 MG/L (ppm)
10/13/2025
Potassium
Detected: 2.5 MG/L (ppm)
10/13/2025
Sodium
Detected: 10 MG/L (ppm)
10/13/2025
Calcium
Detected: 61 MG/L (ppm)
10/13/2025
Properties
General water characteristics like pH, hardness, and cloudiness (turbidity)
Hardness, Total (ASCACO3)
Detected: 190 MG/L (ppm)
10/13/2025
Gross Alpha Particle Activity
Detected: 4.36 PCI/L
1/15/2025
pH
Detected: 8 PH
10/13/2025
A measure of how acidic or basic the water is (7 is neutral). Affects taste and plumbing, not a direct health measure.
PFAS & Emerging Contaminants
Human-made "forever chemicals" and other substances not yet fully regulated
PFHXA
Detected: 0.0059 µg/L (ppb)
1/9/2025
PFHXS
Detected: 0.0055 µg/L (ppb)
1/9/2025
PFBS
Detected: 0.0047 µg/L (ppb)
1/9/2025
Pfpes
Detected: 0.004 µg/L (ppb)
1/9/2025
Lithium
Detected: 9.3 µg/L (ppb)
1/9/2025
Occurs naturally in some groundwater. Not currently federally regulated in drinking water.
PFHPA
Detected: 0.0051 µg/L (ppb)
1/9/2025
PFBA
Detected: 0.01 µg/L (ppb)
1/9/2025
PFPEA
Detected: 0.0097 µg/L (ppb)
1/9/2025
PFOA
Detected: 0.015 µg/L (ppb)
1/9/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
PFOS
Detected: 0.019 µg/L (ppb)
1/9/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Calculated Parameters
Values worked out mathematically from other test results, not measured directly
Alkalinity, Bicarbonate
Detected: 160 MG/L (ppm)
10/13/2025
Other
Additional substances tested that don't fit neatly into the categories above
Alkalinity, Total
Detected: 160 MG/L (ppm)
10/13/2025
TDS
Detected: 260 MG/L (ppm)
10/13/2025
Perfluorobutanesulfonicacid (PFBS)
Detected: 4.9 NG/L (ppt)
10/9/2025
Perfluoroheptanoicacid (PFHPA)
Detected: 3.1 NG/L (ppt)
10/9/2025
Perfluorohexanesulfonicacid (PFHxS)
Detected: 6.1 NG/L (ppt)
10/9/2025
Perfluorohexanoicacid (PFHXA)
Detected: 7.7 NG/L (ppt)
10/9/2025
Perfluorobutanoicacid (PFBA)
Detected: 2.7 NG/L (ppt)
10/9/2025
Perfluoropentanoicacid (PFPEA)
Detected: 3.7 NG/L (ppt)
10/9/2025
Perfluoropentanesulfonicacid (PFPES)
Detected: 4.3 NG/L (ppt)
10/9/2025
Perfluoroctanesulfonicacid (PFOS)
Detected: 21 NG/L (ppt)
10/9/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Perfluoroctanoicacid (PFOA)
Detected: 12 NG/L (ppt)
10/9/2025
One of two PFAS with an enforceable federal limit (4 ppt) since 2024.
Turbidity
Detected: 0.17 NTU
10/13/2025
A measure of water cloudiness from suspended particles.
Conductivity (at 25°C)
Detected: 430 UMHO/CM
10/13/2025
Filtration considerations: See the table below for how whole-house carbon, under-sink reverse osmosis, and under-sink carbon systems compare against what's actually on file here. These are general system types, not a specific product recommendation.