Drinking water quality · 2023

· Verified

What's in Suburban Water Systems-la Mirada — Covina, Ca, CA tap water

45 contaminants were measured in the Suburban Water Systems-la Mirada — Covina, Ca, CA water system's 2023 annual report. Each is shown below against its federal limit 2 sit at or above that limit.

Reporting year
2023
Contaminants measured
45
Over federal limit
2
Approaching the limit
0
Worst contaminant
PFOS
2.0× the limit
Service area
CA
state-level CCR
Source
Utility CCR

PFAS ("forever chemicals")

ContaminantMeasuredStatus
PFOSPerfluorooctanesulfonic acid, a PFAS 'forever chemical' once used in firefighting foam and coatings.8.1 ng/LAverageLocal GroundwaterAt or above the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg8.1 ng/Lrange0–16 ng/L400% of limit
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L0% of limit
PFOAPerfluorooctanoic acid, a PFAS 'forever chemical' once used in nonstick and stain-resistant products.5.4 ng/LAverageLocal GroundwaterAt or above the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg5.4 ng/Lrange0–7.5 ng/L188% of limit
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L0% of limit
Perfluorohexanesulfonic acidPerfluorohexanesulfonic acid, a PFAS 'forever chemical.'1.7 ng/LAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg1.7 ng/Lrange0–3.3 ng/L33% of limit
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L0% of limit
Perfluorononanoic acidPerfluorononanoic acid, a PFAS 'forever chemical.'1 ng/LAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg1 ng/Lrange0–4.5 ng/L45% of limit
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L0% of limit
Perfluoroheptanoic acidPerfluoroheptanoic acid, a PFAS 'forever chemical.'Not detected ng/LRangeLocal GroundwaterNone detected
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avgNot detected ng/LrangeNot detected ng/L
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L
Perfluorobutanesulfonic acidPerfluorobutanesulfonic acid, a shorter-chain PFAS 'forever chemical.'5.4 ng/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg5.4 ng/Lrange0–12 ng/L
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L
Perfluorodecanoic acid (PFDA)Perfluorodecanoic acid, a longer-chain PFAS 'forever chemical.'2.5 ng/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg2.5 ng/Lrange0–5 ng/L
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L
Perfluorohexanoic acidPerfluorohexanoic acid, a shorter-chain PFAS 'forever chemical.'1.7 ng/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg1.7 ng/Lrange0–3.5 ng/L
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L
Perfluoropentanoic acidPerfluoropentanoic acid, a shorter-chain PFAS 'forever chemical.'2.2 ng/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg2.2 ng/Lrange0–1.6 ng/L
  • Treated Surface WaterPlant
    avgNot detected ng/LrangeNot detected ng/L

Disinfection byproducts

ContaminantMeasuredStatus
TTHMTotal trihalomethanes — a group of four chemicals (including chloroform) formed when chlorine reacts with natural organic matter.31 ug/LAverageAnnual AverageWithin the limit
HAA5Haloacetic acids — a group of five disinfection byproducts formed when disinfectants react with organic matter.11 ug/LAverageAnnual AverageWithin the limit
PerchlorateA chemical used in rocket fuel and fireworks that can also form during disinfection.0.4 ug/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.4 ug/Lrange0–1.8 ug/L
  • Treated Surface WaterPlant
    avgNot detected ug/LrangeNot detected ug/L

Disinfectants

ContaminantMeasuredStatus
ChlorineA disinfectant added to drinking water to kill bacteria and viruses.1 mg/LAverageSystem-wideWithin the limit

Metals

ContaminantMeasuredStatus
CopperA metal that enters water from corroding household plumbing.0.3 mg/L90th percentileAt the tapWithin the limit
ArsenicA naturally occurring element that also enters water from industry and agriculture.1.9 ug/LAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg1.9 ug/Lrange0–7.6 ug/L76% of limit
  • Treated Surface WaterPlant
    avgNot detected ug/LrangeNot detected ug/L0% of limit
BariumA metal from erosion of natural deposits and industrial discharge.0.1 mg/LAverageTreated Surface WaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.1 mg/Lrange0–0.1 mg/L5% of limit
  • Treated Surface WaterPlant
    avg0.1 mg/Lrange0.1 mg/L5% of limit
LeadA toxic metal that leaches into water from old service lines, solder, and plumbing fixtures.Not detected ug/L90th percentileAt the tapNone detected
AluminumA common element sometimes used as a treatment coagulant.Not detected ug/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avgNot detected ug/Lrange0–110 ug/L
  • Local GroundwaterPlant
    avgNot detected ug/LrangeNot detected ug/L
BoronA naturally occurring element from rock and soil.140 ug/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg140 ug/Lrange140 ug/L
  • Local GroundwaterPlant
    avg41.1 ug/Lrange0–68.1 ug/L
CalciumA naturally occurring mineral that contributes to water hardness.68 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg61.8 mg/Lrange18–96 mg/L
  • Treated Surface WaterPlant
    avg68 mg/Lrange58–78 mg/L
Chromium, HexavalentHexavalent chromium ('chromium-6') — the more toxic form of chromium.0.9 ug/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.9 ug/Lrange0.9–3.4 ug/L
  • Treated Surface WaterPlant
    avgNot detected ug/LrangeNot detected ug/L
IronA naturally occurring metal common in groundwater.11.6 ug/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg11.6 ug/Lrange0–320 ug/L
  • Treated Surface WaterPlant
    avgNot detected ug/LrangeNot detected ug/L
MagnesiumA naturally occurring mineral that contributes to water hardness.26 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg26 mg/Lrange22–29 mg/L
  • Local GroundwaterPlant
    avg13.6 mg/Lrange12–15.1 mg/L
ManganeseA naturally occurring metal from soil and rock.3.8 ug/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg3.8 ug/Lrange0–6.5 ug/L
  • Treated Surface WaterPlant
    avgNot detected ug/LrangeNot detected ug/L
PotassiumA naturally occurring mineral from rock and soil.4.9 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg4.9 mg/Lrange4.4–5.4 mg/L
  • Local GroundwaterPlant
    avg3.9 mg/Lrange2.7–4.4 mg/L
SodiumA naturally occurring salt component.103 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg67.5 mg/Lrange17–130 mg/L
  • Treated Surface WaterPlant
    avg103 mg/Lrange90–116 mg/L

Inorganic chemicals

ContaminantMeasuredStatus
NitrateA compound from fertilizer runoff, septic systems, and erosion of natural deposits.2 mg/LAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg2 mg/Lrange0–4 mg/L40% of limit
  • Treated Surface WaterPlant
    avgNot detected mg/LrangeNot detected mg/L0% of limit
FluorideA mineral often added to drinking water to help prevent tooth decay.0.7 mg/LAverageTreated Surface WaterWithin the limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg0.7 mg/Lrange0.6–0.8 mg/L20% of limit
  • Local GroundwaterPlant
    avg0.3 mg/Lrange0.2–0.4 mg/L10% of limit
ChlorideA naturally occurring salt compound.104 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg104 mg/Lrange93–116 mg/L
  • Local GroundwaterPlant
    avg69.3 mg/Lrange23–83 mg/L
SulfateA naturally occurring mineral from rock and soil.224 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg224 mg/Lrange196–253 mg/L
  • Local GroundwaterPlant
    avg91.6 mg/Lrange45–99.8 mg/L

Physical & aggregate

ContaminantMeasuredStatus
TurbidityA measure of cloudiness from suspended particles in the water.0.1 NTUAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.1 NTUrange0–0.4 NTU40% of limit
  • Treated Surface WaterPlant
    avgNot detected NTUrangeNot detected NTU0% of limit
AlkalinityA measure of the water's capacity to neutralize acids.184.3 mg/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg184.3 mg/Lrange170–220 mg/L
  • Treated Surface WaterPlant
    avg114 mg/Lrange105–123 mg/L
ColorA measure of visible tint in the water.2AverageTreated Surface WaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.8range0–10
  • Treated Surface WaterPlant
    avg2range1–2
HardnessA measure of dissolved calcium and magnesium minerals.270 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg15.8 mg/Lrange13.74–17.83 mg/L
  • Local GroundwaterPlant
    avg12.6 mg/Lrange8.2–14.5 mg/L
OdorA measure of detectable smell in the water.1AverageTreated Surface WaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.5range0–2
  • Treated Surface WaterPlant
    avg1range1
pHA measure of how acidic or basic the water is.8.2AverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg8.2range8.2
  • Local GroundwaterPlant
    avg7.8range7.6–8.1
Specific ConductanceA measure of how well water conducts electricity, which tracks dissolved mineral content.979AverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg979range888–1070
  • Local GroundwaterPlant
    avg699.3range520–950
TOCTotal organic carbon — a measure of organic material dissolved in the water.2.4 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg2.4 mg/Lrange2–2.5 mg/L
  • Local GroundwaterPlant
    avg0.2 mg/Lrange0–1.3 mg/L
Total Dissolved SolidsTotal dissolved solids — the combined content of all dissolved minerals and salts.621 mg/LAverageTreated Surface WaterDetected — no federal limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avg621 mg/Lrange556–686 mg/L
  • Local GroundwaterPlant
    avg427.1 mg/Lrange310–530 mg/L

VOCs & pesticides

ContaminantMeasuredStatus
TrichloroethyleneAn industrial solvent (TCE) used in metal degreasing.0.4 ug/LAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.4 ug/Lrange0–2.7 ug/L54% of limit
  • Treated Surface WaterPlant
    avgNot detected ug/LrangeNot detected ug/L0% of limit
TetrachloroethyleneAn industrial solvent (PCE) used in dry cleaning and degreasing.0.3 ug/LAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.3 ug/Lrange0–1.1 ug/L22% of limit
  • Treated Surface WaterPlant
    avgNot detected ug/LrangeNot detected ug/L0% of limit

Radionuclides

ContaminantMeasuredStatus
Gross AlphaGross alpha particle activity — a combined measure of alpha-emitting radioactive substances.0.4 pCi/LAverageLocal GroundwaterWithin the limit
+By source (2)Treated Surface Water, Local Groundwater
  • Treated Surface WaterPlant
    avgNot detected pCi/Lrange0–5 pCi/L33% of limit
  • Local GroundwaterPlant
    avg0.4 pCi/Lrange0–3.8 pCi/L25% of limit
Combined RadiumCombined radium-226 and radium-228 — naturally occurring radioactive elements.0.1 pCi/LAverageLocal GroundwaterWithin the limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg0.1 pCi/Lrange0–1 pCi/L20% of limit
  • Treated Surface WaterPlant
    avgNot detected pCi/LrangeNot detected pCi/L0% of limit
UraniumA naturally occurring radioactive metal from erosion of natural deposits.1.7 pCi/LAverageLocal GroundwaterDetected — no federal limit
+By source (2)Local Groundwater, Treated Surface Water
  • Local GroundwaterPlant
    avg1.7 pCi/Lrange0–3 pCi/L
  • Treated Surface WaterPlant
    avg1 pCi/Lrange0–3 pCi/L

Microbial

ContaminantMeasuredStatus
Total ColiformA group of bacteria used as an indicator of overall water-system sanitation.2.7 %MaximumSystem-wideDetected — no federal limit
Source: Suburban Water Systems-la Mirada — Covina, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. utility is required to publish. The numbers on this page are the utility's own. A water-quality report covers an entire service area, not a single address.

People also ask about Suburban Water Systems-la Mirada — Covina, Ca, CA's water

+Is Suburban Water Systems-la Mirada — Covina, Ca, CA tap water safe to drink in 2023?

The 2023 Consumer Confidence Report for the Suburban Water Systems-la Mirada — Covina, Ca, CA water utility lists 2 contaminants at or above the federal limit: PFOS and PFOA. Whether that means the water is "unsafe" depends on which contaminant, how long the exposure, and individual health factors. The table on this page shows the measured value, the federal threshold, and the regulated statistic used for compliance.

+What contaminants are in Suburban Water Systems-la Mirada — Covina, Ca, CA tap water?

45 contaminants were measured in Suburban Water Systems-la Mirada — Covina, Ca, CA's 2023 Consumer Confidence Report, spanning metals, pfas ("forever chemicals"), and physical & aggregate. 17 have an enforceable federal limit; the rest are detected but unregulated. Every measured value, in the utility's own units, is on this page.

+Which contaminants exceed federal limits in Suburban Water Systems-la Mirada — Covina, Ca, CA tap water?

2 contaminants in Suburban Water Systems-la Mirada — Covina, Ca, CA's 2023 report sit at or above the federal limit: PFOS (2.0× the limit); PFOA (1.4× the limit). The EPA enforces these limits against the regulated reporting statistic — typically a running annual average or 90th percentile — not a one-off sample spike.

+What is the worst contaminant in Suburban Water Systems-la Mirada — Covina, Ca, CA tap water?

The contaminant with the highest measured value relative to its federal limit in the 2023 report is PFOS, at 2.0× the federal threshold. It belongs to the pfas ("forever chemicals") family of contaminants.

+Where does the data on this page come from?

Every value is transcribed from Suburban Water Systems-la Mirada — Covina, Ca, CA's 2023 Consumer Confidence Report — the annual drinking-water report every U.S. public water utility is required by federal law to publish. The original source document is archived and viewable on this site. A water-quality report covers an entire service area, not a single address.

+How often is Suburban Water Systems-la Mirada — Covina, Ca, CA's water quality data updated?

Each U.S. public water utility publishes one Consumer Confidence Report per year, covering the prior calendar year's measurements. This page reflects the 2023 report; a new report will replace it once the utility publishes its next annual update.

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